I'm adding a thumbnail photo gallery to my iPhone app which will include an iPhone Photo App-like photo browser plus a detail view for each photo. So far the only thing I've found that provides this is Three20 -- the thing is that Three20 is so huge and has a complex looking API which is not a standard Apple style interface as far as I can tell.
I've also seen this post Open source photo viewer for IPhone which mentions a couple of other photo browsers -- but these don't have thumbnail galleries built in.
My question is: does anybody know of a good combination photo-browser and thumbnail gallery library which is easy to use, not excessively large and easy to customize? Cacheing is also crucial.