id321 is a command line ID3 tag manipulation tool. It supports reading and writing of ID3 tags of the following versions: ID3v1, ID3v1.1, ID3v1.2, ID3v1.3, enhanced tag, ID3v2.2, ID3v2.3, and ID3v2.4. The utility can force standards of ID3 tags in order to fix existing non-standard tags.
IKNetworkActivityManager is a Cocoa class that simplifies work with UIApplication network activity indicator. It turns your networkActivityIndicatorVisible = YES/NO code to add/removeNetworkUser:, so you don't need to remember objects that can use network anymore. A demonstration App is available.