ASIHTTPRequest is an easy to use wrapper around the CFNetwork API that makes some of the more tedious aspects of communicating with web servers easier. It is written in Objective-C and works in both Mac OS X and iPhone applications.

The iPhone needs a better way to make HTTP requests, specifically calls to REST web services. Seriously mixes Blocks with NSURLConnection & NSOperationQueue to do just that. It also will automatically parse the JSON response into a dictionary if the response headers are set correctly.