Was bored, and I found this on the MC forums.
Massive list of interesting seeds to type in when generating a new world
Look out for:
isaidahiphopthehippiethehippietothehiphiphopyoudontstoptherock - Gives you extremely flat land.
omgjizzfacelol - Above ground dungeon?
Megan Fox - Lots of islands
and many more...
Post your own interesting seeds in here too