With a simple registry tweak, you can take that 30-day activation deadline and shove it—possibly forever. According to Brian Livingston, publisher of Windows Secrets, the activation delay hack previously thought to work for 120 days can be reused "indefinitely," though it varies from copy to copy.
The haxx0ring? Change a registry key (SkipRearm) hex value. That's it, but check the article for a full rundown—newer shipped copies of Home seem to have plugged the loophole, so it may only work in other versions shipped after March. Guess they really do want you to pirate Windows.