) then know that you're eligible for some bonuses in Ratchet & Clank: A Crack In Time. Stephen Totilo of Kotaku has detailed the upgrades he received based on his progress in previous games. For example, those who have played Tools Of Destruction will be eligible to cheaper "returning customer" rates at the vending kiosks. If you've played Quest For Booty too you'll receive a fetching pirate hat for Ratchet to wear.
There's been a lot of inter-game connectivity lately. Personally, we're loving it.