Genres don't seem as insular these days? Everyone kinda likes a bit of everything. So maybe there's less need for artists to cross-pollinate themselves in order to try and cross-pollinate their fans. Whatever the reason, you/I don't see stuff like this...

http://www.discogs.com/Various-Judgment-Night-Music-From-The-Motion-Picture/release/242542

1 Helmet) & House Of Pain - Just Another Victim
2 Teenage Fanclub & De La Soul - Fallin'
3 Living Colour & Run D.M.C. - Me, Myself & My Microphone
4 Biohazard & Onyx - Judgement Night
5 Slayer & Ice-T - Disorder
6 Faith No More & Boo-Yaa T.R.I.B.E. - Another Body Murdered
7 Sonic Youth & Cypress Hill - I Love You Mary Jane
8 Mudhoney & Sir Mix-A-Lot - Freak Momma
9 Dinosaur Jr* & Del Tha Funkee Homosapien - Missing Link
10 Therapy? & Fatal - Come And Die
11 Pearl Jam & Cypress Hill - Real Thing

...as much as you/I used to. Or do you? Either way, what's not to like?

Other band collaborations / genre crossovers worth a mention?