I used to live in Sacramento, CA and we used to get these, or something like these in our house. I recall seeing some with red on them instead of green. And (I may be wrong) I think I remember blue ones as well. but that was about 16 years ago, so... (grain of salt)

I do remember it was quite painful to be bitten.

I just checked out the caterpillar Page at USGS: http://www.npwrc.usgs.gov/resource/2000/cateast/alypocto.htm and it looks like the caterpillar may be Eight-spotted Forester (Alypia octomaculata). I'm just a hobbyist at this, so I may be mistaken but check it out yourself.

Nice shot. I followed the links from the first comment and found what looks like a matching shot at the following site. http://tolweb.org/tree?group=Phidippus_audax&contgroup=Phidippus If correct it looks like a female Phidippus audax. Now I'd like to know what the catterpillar is.

A Canadian colleague of mine has done considerable work on jumping spiders. He did some studies on a Phidippus sp (species) that had bright green peds. It might be what you're looking for -- http://www.biology.ualberta.ca/bsc/news19_1/spiders.htm. I Hope this helps -- his Phidippus was furry, but your's looks sleek and bald.