Google has just released Google App for Windows Mobile, which essentially gives you a quick-search bar on your today screen, and quick-launch icons for Google Maps and the like. If you use Google apps within your own domain, you can do that here, as well.
Check out the video above for more details, and hit up m.google.com/search from your phone to download.
Update: Um, yeah. Malatesta sends word there's a bit of a UI problem when it comes to his 320x320 screen. (And it's not working too hot with my 6.1 sliding panels, either.) Anyone else seeing any problems?