Great thread! I'm going to have to second the Troma titles i've seen here. Here's a list of some others I love.
The Evil Dead - This is a B-Movie classic!
The Slumber Party Massacre Series - I think I saw one of them, but I don't remember it truth be told.
The Vincent Price/Edgar Allen Poe Films - These are classics! I love 'em.
Leprechaun 2 - Warwick Davis was great as the Leprechaun, but honestly not much other reason to watch this one or it's predecessor. I guess it was better than the others though... *barf.*
Witchcraft 1-100 - Haven't seen any of them.
Return of the Living Dead - SEND MORE PARAMEDICS!
Braindead - Oh Lionel, your dear mother is home! That giant puppet always gets me, even though the rest of the film is still fantastically twisted and warped.
Dead Snow - Never heard of it.
Starship Troopers - Not a fan. It had moments I guess, but save for RoboCop I detest the Paul Vanderhoven or whatever his name is.
The Monster Squad - I love this movie! One of my childhood favourites. I still love it!