I don't know about you guys, but I find myself loading up JJ2 and playing around in the singleplayer. I don't play much once I get into the levels, but I try often.
I've been looping tunes from JJ2 (mainly Medivo Jam, Diamondus Remix, and Labrat), and even am going to NoogyLand to drool at Jazz.

All hail Jazz Jackrabbit, the greatest Hero the world has ever knowed! (known)