Hello I am building forms over and over in iPhone and iPad apps:
I don't know if this counts as an answer, but i use Sensible Cocoa - Sensible TableView (STV) for this purpose a lot. It's not a "forms" framework (on top of UITableView) as such, but it can be used for this purpose in a very flexible way. It still requires some coding to build a full-fledged form but the UITableView/UITableViewController boilerplate code is reduced to a minimum. Unfortunately the developers bumped the price tag quite high with version 3.0, so i'm actually looking for a STV replacement right now. (I'd stick with STV if it wasn't for the price!)