Every Celebrity wants to be on Glee! (a list) 

From that list I'd like Julie Andrews, Anne Hathaway, Liza Minelli and MAYBE Cee Lo Green and Daniel Radcliffe. And it'd be kind of interesting to see what en episode with Snoop Dogg would be like. lol! I'm thinking Snoop and Artie? haha...
As long as the the guest star's storyline makes sense and isn't like the one Britney Spears had (Britney numbers because of the anesthesia? Really?), I'm good with it.

If Daniel Radcliffe got a guest spot and the two Harrys met, the world might implode from awesomeness.

A good way to go, methinks.