I just tried compiling my FMDB SQLite wrappers against the iPhone SDK, and hey- it seems to work!
These are the classes I use in VoodooPad, so they are pretty solid in my experience (although I do use a custom build of sqlite against it). And since CoreData isn't availble on the iPhone, I figure developers might find these classes useful.
For how it's used, check out the fmdb.m file, and you can also download the entire archive. And if you have any bug fixes or ideas, send em along.