Okay, here is a list of what I have that will be here (some is out on loan or in the shop), combined with what I know others are bringing. If you are bringing something that is not on here, PM me and I will edit this post (which should hopefully cut down on the wasted bandwidth we would have if we all posted replies to this post).
The Master List!
Amps:
Acoustic Image Focus III (mike's)
Aguilar AG500 (jmb7183's)
Aguilar DB 359
Aguillar DB 750 (I couldn't resist!

)
AMP BH420 (Vision's)
Ashdown Labs AL-MK500
EA iAMP 350
EA iAMP 500
EA iAMP 800
EBS HD350 (Vic's)
Eden VT-300A
Hughes & Kettner BassBase 600
Mesa Booge Basis M-2000
Mesa Boogie Walkabout
Music Man HD-500
Peavey Classic 400
Sadowsky SA200
Thunderfunk TFB 550 (Ken's)
Thunderfunk TFB 550(B) (Vic's)
Trace Elliot Hexa Valve
Trace Elliot Quatra Valve
Trace Elliot V8
Trace Elliot VA400
Traynor TS 200
Traynor YBA200
Tube Works RT-2100-ES
Walter Woods Ultra
Preamps:
Aguilar DB 659
Aguilar DB 680
Alembic F-1X
Alembic SF-2
Ashdown EVO II RPM-1
Avalon U5 (see also "Direct Boxes")
Bergantino line driver (prototype)
Demeter HBP-1
Demeter VTBP-201s
EBS MicroBass II
Eden Navigator
Epifani Quest II
Fender TBP-1
Hughes & Kettner Fortress
Kern IP-777
Peavey Bass-Fex
Peavey TMP-1
PreSonus Eureka
Raven Labs MDB-1
Raven Labs PMB II
Read Purity
SansAmp PSA-1 (Tim O's)
Skjold Pro Sound prototype tube preamp (Proto #2)
Skjold Pro Sound prototype tube preamp (latest iteration)
Stewart UDP-1a
Summit Audio TD-100 (see also "Direct Boxes")
The Low End True Voice (table top)
Trace Elliot GP12 SMX
Trace Elliot GP12 XV
Power Amps:
Aguilar DB 728
Crest CA9 (three)
Demeter VTHF-300M
Mesa Boogie Strategy 400
QSC PLX 3002
Stewart World 2.1
Trace Elliot VR350
Cabs:
Accugroove Mini Whappo
Accugroove Tri 208
Accugroove Whappo, Jr.
ACME Low B-2 II (two)
Azola Super Wizzy 2x12 (two)
Bag End S12-D
Bag End S12X-C
Bag End S12E-C (with ELF M2 Processor)
Bag End S12E-D (with ELF M2 Processor)
Bag End S18E-C (with ELF M2 Processor; two)
Bergantino custom 1x15 sub's (two, in HT322 boxes)
Bergantino EX112
Bergantino HT112 (two)
Bergantino HT115 (two)
Bergantino HT210
Bergantino HT210S (4 ohm; Ken's)
Bergantino HT310 (two)
Bergantino IP112
Bergantino IP212
Bergantino IP310
Bergantino IP322 (the only one in existence!)
Bergantino NV215
Bergantino NV610
EA CxL-110
EA CxL-112 (two)
EA CX-310
EA NL-210 (three; one 4 ohm)
EA VL-108 (two)
EA VL-110 (four)
EA VL-208 (five, one 4 ohm)
EA VL-210 (two)
EA Wizzy (two)
Epifani T-110UL (two)
Epifani T-112 (two)
Epifani UL112 (hopefully two; Mike's)
Epifani UL310 (Vision's)
Epifani UL410 (Ken's)
Glockenklang Duo
Glockenklang Duo Wedge
Glockenklang Space Deluxe
Hevos Midget
Low Down Sound 3-way neo 1x8
Low Down Sound 3-way neo 3x8 (two; one is Ken's)
Low Down Sound 2x15/2x6 (Chris')
Low Down Sound neo 2x10 (Steve's)
Low Down Sound neo 2x12 (Mike's)
Mesa Boogie Diesel 4x10, “Deep” version
Mesa Boogie Diesel Powerhouse Jr. (1x12, 4x8)
Music Man HD-212 (two)
Patterson Audio 2x8's (two, 2-way w/ titanium tweeters)
Peavey 1820
Raezer's Edge Bass 10 (RIP, Rich)
Sadowsky SA210
Sadowsky SA410 (two on Friday night, Pat's)
Schroeder 1210 (Ken's)
Trace Elliot 4052H (4x5 "Bright Box")
Traynor TS 98 (9x8)
Combos:
Ampeg VT-60 (guitar amp)
Fender RAD Bass
Phil Jones Briefcase
Roland Bass Cube 100 (Vic's)
SWR Baby Blue
SWR Baby Blue II
Trace Elliot Valve Twin Combo (1x15)
Electric Basses:
Alembic Series I (James')
Rob Allen MB2 fretless 5 (Ken')
Carvin 6 (G's)
Celinder J-Update 5 (Ken's)
Curbow American Petite 5
DeArmond Pilot 5 Deluxe (w/ upgraded electronics)
Dean 8-string (Chris')
Epiphone EA-260 semi-hollobody shortscale
Fender Jazz (1973)
Fender Jazz with flats (Tim O's)
Fender Geddy Lee Jazz (w/ J-Retro; Chris')
Fender Geddy Lee Jazz (Steve's, formerly Tim's)
Fender Marcu Miller Jazz (Dan's)
Fodera Emperor Deluxe 5
Fodera Matt Garrison 5 (Mike's)
G&L ASAT (Chris')
Gibson Explorer
Gibson Thunderbird IV
Gretsch Broadkaster
Hanewinckel Ceres Artist (James')
Hoyt Custom 4 (jmb7183's)
Jerzy Drozd Excelleny V
Lakland Skyline Darryl Jones 4 (two on Friday night; one is Pat's)
Lotus 4-string (my first bass!)
Marchlewski 5 (James')
MTD 435
MTD 535 (Vic's)
MTD Custom 535 - chambered prototype (two; Marilyn #3 and Vic's Marilyn #8)
Music Man Stingray (Pat's; double humbucker)
Peavey Cirrus 5 (Vision's)
Read Model-J
Reverend Rumblefish (Chris')
Rickenbacker 4001 (Chris')
Ritter Roya 5 (NAMM 2005 bass)
Roscoe LG-3005 (Vic's)
Sadowsky 25th Anniversary 24-fret 5-string
Sadowsky MV5 NYC (Steve's)
Skjold Custom 5
Skjold Exotic Custom 4
Skjold Stage 4
Tobias (pre-Gibson) Basic 5, # 766 - Jimmy Haslip model
Tobias (post-Gibson, Burbank) Basic 5, # 1353
Tobias (pre-Gibson) Classic 5, # 601
Warwick Corvette Std. Fretless 4
Acoustic Bass Guitar:
Epiphone El Capitan
Tacoma Thunderchief CBM15CE4 (mahogany top)
Tacoma Thunderchief (Dan's)
Upright Bass:
BSX Allegro 5 (Mike's)
Kay C-1, with Barbera Bridge Transducer pickup
Knilling upright with full circle (Chris')
Direct Boxes:
Aguilar DB 900
Avalon U5 (see also "Preamps")
Demeter VTBP-2B
Groove Tubes PDI
Raven Labs MDB-1 (see also "Preamps")
Raven Labs PMB II (see also "Preamps")
Summit Audio TD-100 (see also "Preamps")
Effects:
Akai Deep Impact
Akai UniBass
AnalogMan Clone Chorus (with deep option)
Bag End ELF M2 Processor
Carl Martin Heavy Drive Distortion
Chandler Tube Drive (rackmount)
Danelectro Daddy-O
Danelectro Milkshake Chorus
Demeter Compulator
Demeter FOD-1
Digitech Bass Synth Wah
EH Big Muff Pi
EH Q-tron
EH White Finger compressor
Fulltone Bass-Drive
MXR Phase 90 (G's)
MXR Phase 100
Peavey Tube Sweetener
PreSonus ACP-22+
Raven Labs True Blue EQ
Tube Works Blue Tube (rackmount)
Tube Works Tube Driver (rackmount)
Misc.:
Boss TU-2
Kart-a-Bag Tri-Kart 800
Korg DT-7
Korg Triton Rack
Mesa Boogie SUS-4 Racks (two 4-space, one deep 8-space, one regular 8-space)
Revolution Solo upright bass pickup
Roland PK-5 MIDI pedals
Shure ULXS14 Wireless
X-Wire Wireless
I believe the list to be complete at this point, so please let me know of any corrections/additions/subtractions. I'll be sure to add anything else I manage to "assimilate" between now and the GTG.
Tom.