OK, to kick off my links here are some interesting diversions
This game is particularly good, take a small team of survivors in a fortified town and try and stop the hordes of zombies and expand the fort while keeping everyone happy. Thankfully (for me) this isn't a RTS game, rather a turn based one. Heartily recommended.
The second one is a different take on the zombie apocalypse. This game involves taking the part of the evil genius and trying to take over the world. A very fun game, which is well worth whittling away a few minutes with.
If you know of any good zombie online games, perhaps let everyone know in the comments section.
Until next time