For young 'uns I'd suggest Poo - a quick and fun game involving monkeys and ... poo.
Bohnanza is fun for another quickie. Kill Dr Lucky is an awful game, played it once and never again. Zombies - no thanks... talking of No Thanks - that's a nice little game also.
Arkham Horror - I have the smaller expansions and a couple of the bigger ones, very good game although can last a while. Far better than the Chaosium game, which was good.
I have 3rd ed Talisman and all the expansions, not played it for ages though. I'd like to try the new edition, but won't invest.
Runebound is fun, again a longer game.
Dungeonquest is fun also, I have just boutht the complete GW edition for �21 including postage, which is a snitch since the expansions are still going for �40+ (plus I can get a tenner for the spare base game I have already). Not seen the new version.
Tomb is a dungeon bash type game but quite quick and can get messy.
Castle Ravenloft - I have played it and found it decidedly average. OK but nothing special so won't be getting it.
Other nice games are The Hanging Gardens (quick and easy), Stone Age (worker placement/set collection) which plays in about an hour, and Vikings.