Small World - is basically a recreation of this game in a fantasy setting from the same creator. There's a set of races/tribes and a set of attributes and these are randomly combined to give pairings (Wealthy Hobbits, Flying Orcs). Other than that it's basically the same game, with a couple of tweaks. It was very good fun, and I'd recommend it to pretty much anyone - Mum managed to pick it up in three rounds, despite having had a couple of drinks.
Bohnanza - was also great fun. A simple card game where people collect bean cards (Bohn being German for bean), swap them with others and plant them in two bean fields (with an optional third one). It's much more social than the board games we played, with constant interaction between all the players as they tried to get the cards they wanted and dispose of the ones that were blocking them (you have to play your hand in the order you got the cards). I'm actually tempted to pick this one up myself.
Caylus is a game that I feel conflicted about. You build buildings, buy favours from the king, build bits of the castle for victory points and try not to give away too many points to your competitors. I enjoy it somewhat, and I feel I have a decent grasp on the mechanics, but I've never managed to come up with any kind of decent strategy for it. It always feels tactical - lots of little advantages that scrape out a point or two, rather than something that gives me direction during the game. Which is fine, it's just not terribly satisfying. It's ranked 10th on BoardGameGeek, so clearly lots of other people disagree with me (and generally I agree with their ratings - I love the current top three.