You know, I'm honestly not a huge Bonham fan. Some of his grooves (e.g. Levee) are great, but a lot of the time I find his drumming to be kinda flat. Powerful, sure, but lacking a real (I don't know how to explain this adequately, so don't rage on me!) but flair. I just find his drumming a little boring sometimes. For instance, Moby Dick, I just get bored with it. I like drum solos but Moby Dick bores me.
Other drummers I could listen to all day: Terry Bozzio (thanks to whoever mentioned him before

), Dave Weckl and Jimmy Chamberlin. Scott Amendola's pretty damn good too. Steve Perkins
was good, but I think he's been playing too stereotypically 'rock' for the last few years.