AppToDate is a new utility for Windows Mobile devices that checks to see if the software you have installed is up to date, and, if it's not, it will automatically download the updates you need. Unfortunately though, only the following applications are supported: .net CF Config, CamerAware, Nested Tasks, NoData.
However, this software is still a very early beta, so more apps will be supported later on. Developers who want to include AppToDate support with their app can check out the info on this page on how to do so. (via DownloadSquad)