I guess I can list bands that have toured with LP in the past. In that case, here's a selection of bands that would greatly benefit from a tour with LP (because those tours seem to do well for those bands, Placebo seems to be doing alright in the states as a result of PR07).
-Muse (durrr)
-Coheed and Cambria (fucking sweet)
-10 Years (PR gave them a huge audience...I don't Hahninator would be as into them if it weren't for PR08)
-Alice in Chains (Chester collaboration would be imminent)
-Chimaira (Might be a mainstream tour to put them on, but I think a PR could greatly benefit from a really heavy-ass band...not saying wouldn't be fit for an arena tour, but I just think that a sidestage tour such as PR would be better)
-Deftones (Such a tight band)
-Gojira (Could alienate certain people in the crowd but these guys need a big break in the states, even though they toured with Metallica in the states)
-Shinedown (Total crowd pleasers and their music is sweet too)
-Snoop Dogg (Tha Boss D.O.G.G...need I say more?)
-Dr. Dre (When Detox FINALLY comes out, this could be a great outlet for promotion)