I don't know if they're the best, but they're my favourites:
Stray Cats
Stevie Ray Vaughan and Double Trouble
Scott Henderson Blues Band
Scott Henderson, Jeff Berlin, Dennis Chambers (I'll see them next month!)
Walter Malosetti Trio
And if...
All Oscar Peterson's trios, Oscar Peterson (p) with:
-Barney Kessel (g) and Ray Brown (b), 1951-1953
-Herb Ellis (g) and Ray Brown (b), 1953-1959
-Ray Brown (b) and Ed Thigpen (d), 1959-1966
-Sam Jones or George Mraz o Michel Donato (b) and Ed Thigpen or Louis Hayes or Bobby Durham (d), 1966-1971
-Joe Pass (g) and Niels Pedersen, early 70's, mid-80's
-Niels Pedersen or Dave Young (b) and Martin Drew (d), late 70's, 80's. After that he used to play almost exclusevely in quartet.
Don't forget the great 1977 Montreux album "Oscar Peterson and the Bassists", with both Ray Brown and Niels Pedersen.
Some more cool trios:
Toots Thielemans (hca), Joe Pass (g), Niels Pedersen (b)
Stéphane Grapelli (vln), Joe Pass (g), Niels Pedersen (b)
Nat King Cole (p, vcl), Oscar Moore (g), Wesley Prince (b)
Art Tatum (p), Al Casey (g), Slam Stewart (b)
Benny Goodman (cl), Teddy Wilson (p), Gene Krupa (d)
and many many many more...