Two completely different games, but both pretty fun. I played both this last weekend.
Nuns on the Run is your traditional board game with a fold out board, dice, and some cardboard tokens. The idea is simple, play 1 of 6 novites sneaking around the convent at night while the Prioress and Abbess patrol the grounds. This game manages to capture a little bit of the drama you feel playing hide and sneak as a kid. The only quirky bit is that the novites must write down each of their moves in secret so no one really gets to discover how crazy the chase was until someone wins. The novite wins when she gets the right color key, unlocks the door to her randomly chosen objective, and gets back to her room undetected. This game is high on fun factor, but would be harder for kids under about 10 to figure out. You have to count off your moves in secret and write them down. This might be a challenge for the younger players.
Death Angel is one of Fantasy Flight's small format games. The box is only about 5 inches by 8 inches. Inside is a collection of cards and some cardboard "support" tokens. Death Angel is a spin-off game to the Games Workshop Warhammer 40,000 franchise. It is a cooperative game where the plays each take control of a pair of Space Marines as they attempt to explore and neutralize an infested "space hulk". The game makes very creative use of simple cards to create a quite complex game. Players familiar with Warhammer will like the concept, but the rules are so unlike Warhammer 40k that no experience is necessary. The complexity will rule out the casual or younger game player.