Please allow me to plug my current favourite series:
http://www.webscription.net/10.1125/Baen/0671578499/0671578499.htm
1632, by Eric Flint. Lot’s of good, alternate history fun :)
These have become favorites of mine, excellent stories, twisty plots, and the humor is up my alley. I have gone back and re-read them over again and constantly find where I didn't catch something the first time.