While we were working our newest iOS app: BandFriend ( coming soon, check out its website ), we needed some way to display some sort of hints, alerts and guides to the user. Those hints needed to be presented in a non-modal fashion and had to be somewhat customizable. We created a small little library called TBHintView to do perform that job in an easy to use manner.
You can find the results here at GitHub. Feel free to use the TBHintView library in your own iOS projects.