ARC compatible, iOS 5 specific grid view implementation by Gulam Moledina. I think there are enough of these now that Apple should seriously think about creating their own or extending UITableView to support multiple cells per row. Until that happens, this looks like the best 3rd party implementation I have seen so far.
Sam Vermette with a HUD component for indicating hardware changes. As he says in the release notes, Apple uses this type of UI specifically for hardware notifications (volume, keyboard, etc...) and you should too. If you need a more general purpose progress HUD then he also created SVProgressHUD.
Just in case you hadn't come across it before, the aforementioned SVProgressHUD.
An active record implementation which sits on top of Core Data modeled on the Rails implementation of active record. Core data can be pretty verbose at times so this might be worth a look.