And here we go, in no particular order:
Tom Hanks. If you had asked me back when he was running around in a dress if I would ever like this guy, I would have mocked you mercilessly for even suggesting it. But it turned out that he has HUGE talent and can really make me believe him in so many roles. I loved him in Big, where he really managed to make me believe he was a young boy in a man's body. The baby corn scene is priceless.
Heath Ledger. I liked Heath well before the Dark Knight. I first noticed him in The Patriot and was pretty impressed. Then came A Knight's Tale, which is a fairly fluffy film, but he was funny and fun, and there was one scene, where he's watching his Dad through a window, where the look on his face is so convincingly that of a son seeing his loved father for the first time in many years. He broke my heart in Brokeback Mountain.
Mickey Rourke. I wish the guy's life wasn't such a trainwreck. But back in his heyday I saw everything he was in, because he always turned in very charged performances. I particularly liked him in Angelheart and Barfly.
Eric Roberts. Roberts has got to be one of the underrated actors of all time, in my opinion. He's certainly gotten lost in the shadow of his baby sister, but he seems to be just fine with that, so that's all good. From Star 80 to Runaway Train to The Coca Cola Kid, to The Pope of Greenwich Village, the list of films he has turned out amazing performances for is LONG.
Gene Hackman. I don't think this man is capable of turning in a bad performance. My favorites of his include Mississippi Burning, French Connection, and Crimson Tide.
Dustin Hoffman. Short, funny looking, and for some reason, hot as anything. I'll never forget him in Marathon Man, among so many others.
Michael Keaton. I loved Beetlejuice, the man was hilariously funny. But it was Clean and Sober that cemented Keaton in my list of favorite actors.
David Morse. Not incredibly well known, but you'll know him if you look at his pic on IMDB. He played Brutal Howell in The Green Mile, and co-starred with Jack Nicholson in The Crossing Guard. He was also House's nemesis on the TV show House for a season or so. He can play everything from the good guys to the bad guys, and you believe him in all of his roles.
William Fichtner. Last seen as the bank manager in The Dark Knight, he was also the shuttle captain in Armageddon, and the Bad Guard in the Adam Sandler remake of The Longest Yard. I haven't seen a lot of his stuff, but I really, REALLY like what I've seen.
Adam Sandler. I love this guy. His humor isn't mean, his characters are generally pretty ethical and decent guys I'd love to hang out with, even if they ARE a little irresponsible. And he makes me laugh and laugh.
Okay, this list could go on forever. Tell me about some of YOUR favorite actors.