http://www.youtube.com/watch?v=nz4nP5AmE94&NR=1
I have Ed Friedlands 'Slap Bass' dvd and after watching it over and over again (i had it since 2004) i always seem to get thoroughly tied up in knots & twisted up like a pretzel trying to remember all the steps.
This guy here seems to have 'scienced it down' to a little mathmetical equation, that even *i* can understand, lol.
And yes, i've seen bits of the Alex Slavenski slap clip on youtube.