SCEE has announced that they'll be changing their policy regarding sharing games between consoles on the same account. Players will be able to activate a PSN game on up to two PS3 or PSP consoles via an online tool, which may eliminate the aggravation associated with upgrading consoles and calling up customer support to reactivate your downloadable library. However, it's a sharp decrease from the usual five, suggesting that this may be in response to the recent financial tribulations. You can check out a comprehensive guide through the link.
This new policy will go live as of November 18th, and will only apply to games purchased after that date. It will not affect titles you've already bought.