Access Google Services on Your Windows Mobile Smartphone with Google2Go
Specifically, you can use the tool to tap Web and local searches, Gmail, Google Calendar, Google Reader, Google Docs, Picasa, and more. It's pretty cool, as shown in the above video.
However, the system requirements are a bit steep: You need a smartphone running Windows Mobile 6 and the Windows Mobile .Net Framework 2.0. I don't have one on hand at the moment; if you do, let me know (in the Comments, natch) if Google2Go is as useful as it is pretty. [via Google Blogoscoped]