Launched about a week ago, the Bluefire Reader App for the iPad (and other iThings) lets you borrow OverDrive eBooks, download them to your PC, then sideload them onto your iPad through iTunes.
This is incredibly cool. Before this App came out, we could sideload OverDrive audiobooks to the iPad by treating it like a really big iPod. But OverDrive eBooks and even most DRM-free eBooks weren't an option.
If you have an iPad, get the App (It is free) and follow the instructions. They're not Geico caveman simple, but they are not bad. Our version of them is on the Cheat Sheets page of this site.