From the main title screen, players can choose to import Trophy data from the original game that will grant access to in-game perks in Infamous 2:
Good or Evil Trophies from Infamous (not full good or full evil, just some) - Start Infamous 2 at level 1 good Karma or level 1 evil Karma
Trophies indicating players collected 25% of the blast shards from Infamous - Yields free energy cores in Infamous 2
Trophies indicating players collected 50% or more of the blast cores in Infamous - Unlocks two free energy cores
Infamous 1 Completest Trophy - Finished Infamous with any karma standing on any difficulty, unlocks 1000xp bonus for Infamous 2.
Specific Trophies indicate decisions made in Infamous reflect side missions, Dead Drops and even dialog variety in Infamous 2.
Note that if you've replaced your hard drive, you won't get an option to use old data until you install inFamous 1.