How 'bout a coffee?
I recently got myself addicted to the Anno 1404 series "Dawn of Discovery". I love strategy building games but somehow missed this whole series until now. I think the best thing about this game is the re-playability. I love they have random maps. I really hate games that don't ship with some sort of generator.
The funniest thing tho is every 2 hour mark you have been playing, the computer voice says things to encourage you to take a break. I almost rolled out of my chair the first time I heard it.