I recently bought a handy iPod accessory that you might also have a need for, the PocketDock. It's a simple adapter that lets you use 1st and 2nd generation iPod accessories with the 3rd generation "dock connector" iPod.
I have a few accessories, such as a car charger, that I'd have to replace if it weren't for the little plastic widget. At $19 it's not cheap, but it's better than buying, and having to carry around, cables that serve only one purpose. Now I can use the Firewire cable for the iSight, for example, with my iPod. One less thing to haul around. The PocketDock is sturdy, works well, and its color and texture match the iPod. It's nice that they paid attention to these details.