Puck - Love Chancellor, was definitely one of the ones escaping me at the time. Victor Wooten is one of the obvious ones on my list too, as is Lemmy, and Bootsy Collins. Jaco shouldn't even have to be mentioned (!) and JPJ I love as just an all around awesome musician. Throw in Aston Barrett for good measure.
Also gotta agree with BladesOfSteel on flea being on there. Say what you will, the man is a musical genius. My favourite album of his though isn't with RCHP, gotta be his work on The Mars Volta's Deloused In The Comatorium. He also has a pretty amazing "instructional video" hosted by River Phoenix in which they are both clearly high as fuck that I think is pretty hilarious/amazing.http://www.youtube.com/watch?v=_Ac9DpeB-xM
Juan Nelson, anyone? He's just such a massive, lovable presence on stage, and he lays (laid) down some fat and super funky basslines for Ben Harper. ...He might be on this list just because I love the guy, but he's got chops too. http://www.youtube.com/watch?v=z52rhGypiy0
Since most of the classics have been named, I'm going to take one out of left field; how about Ryan Martinie of Mudvayne? This is mainly because of their first album, LD 50, in which he plays like a freakin madman, virtually plays lead bass on that album. He then came out and said he wanted to play more in the background, which is all fine and good, but lost a bit of it's "wow" for me and they were never the same.http://www.youtube.com/watch?v=2rgCDfDxe1khttp://www.youtube.com/watch?v=wWhl-xEEYUY
Finally, Ryan Stasik! Do yourself a favour and go here:http://iclips.net/watch/umphreys-mcgee-all-good-2009
and click on Wappy Sprayberry > All In Time. This version of All In Time just blows my freakin mind. Can't say enough good things about it. Hope you have 30 min to spare. ...and a doobie. Give it time, as it builds to an epic climax.