I finally took the plunge today (well, a minor plunge), and retrieved my unused-for-almost-14-years Bianchi Eros from where it was stored. I've asked some questions about it here, and got sufficiently pumped up by the answers to decide to take it out of mothballs, even if I do weigh 64 lbs more now than when I used to ride it.
I'm going to try to save the wheels - I'll need to sand some gouges out of one of the rims, where it hit some cobblestones the last time I rode it. But they're decent wheels, with 32 spokes front and back, so I think they'll be strong enough to support me. But obviously, after 14 years of sitting, the tires and tubes are toast.
It currently has 700 x 25c tires on it. I plan to ride it on the road, but also maybe on some MUPs that are, IIRC, a mixture of paved and not so paved. What would be good tires to get? Should I stay with the 700x25, or go to 700x28? I don't think bigger tires will fit - there's not a lot of clearance there now.