If you want Primus downloads, they offer loads of bootlegs on their page.
http://www.primusville.com/boot/boot_main.htmlBut as far as albums go, look out for Frizzle Fry if you can get your hands on it. And Tales from the Punchbowl, thats my favourite album.
You might also be interested in some of claypools other projects, most of which are more jam oriented. You can find those on
http://www.lesclaypool.com (I'd recommend you check out the Frog Brigade)
Probably the easiest way to get into Primus, is to buy their latest release, which is a greatest hits.
http://stores.musictoday.com/store/dept.asp?band_id=362&dept_id=833&sfid=2Primus were big for me, so I'm always happy to help with getting other people into them.
Claypool is a pretty eccentric guy at times, so I think it's always great to get the dvd's to see what goes on at one of his gigs.
Animals Shouldn't Try to Act Like People is a collection of primus videos and short film type things.
Hallucinogenetics Tour, a live show from Primus' final tour.
And, 5 Gallons of Diesel is a collection of live videos and some other bits that Claypool has been involved in, its got, Sausage, Oysterhead, Frog Brigade, and others I cant remember the names of.
But if you insist on downloading, I think these are the Primus tracks you should look for:
Jerry Was a Racecar Driver
Tommy the Cat
Southbound Pachyderm
Lacquer Head
John the Fisherman
My Name is Mud.