Steve Dunn , Aug 09, 2006; 02:35 p.m.
If they've been stored in reasonable conditions, chances are they'll still be usable, though they probably won't look quite the same as they would had they been used and processed promptly. "Reasonable" primarily means not too hot; room temperature is OK, and the fridge or freezer would be better. If they've been in the trunk of your car sitting in the hot sun for the last six years, they're probably toast; sitting on a shelf next to a window where the sun streams in every day is also a bad thing for film.
If you want it handled by a specialist, contact this company or one of their competitors (but there aren't many companies who specialize in processing old film). They will charge you much more than your local one-hour lab, and as they note on their Web page, with old film, you can expect some changes like colour shifts (although "old" to a specialist company like this is more likely to be measured in decades than in years).
Your local one-hour lab can process this film; it uses the same chemistry as current films. The results from a specialist may be a bit better, but unless they're pictures that are particularly important to you (and if they were, chances are pretty good you'd have developed them shortly after taking the pictures), the difference probably isn't worth the price.
Another thing you could try is to have one roll processed at your local lab. If the results are good, get the rest processed. If they're bad, send the rest off to a specialist lab.