Yep, they will charge you about $75 to check things unless a problem is actually found. The only big thing I can think of that might be worth having checked is the exhaust manifolds; especially the passenger side, but you have until 5 years or 60K on drivetrain and having them checked is no guarranty that the dealer does it or is competent enough to tell when one is cracked.
The only other issue that seems to only apply to 2001's is a power window problem. Apparently Nissan went to a plastic clip in the window regulators (this is what I've heard anyway) and some people have had problems with them breaking. Problem is, this isn't something you can have the dealer check; the windows either work or they don't.