I was just over on the treo 600 threads and they have started a "Navigations Tips Thread".
This thread is for tips or tricks on navgating through your treo650 that you've found on your own.
e.g., on a web page, the space bar take you back to the top menu. Or the back button takes you to the previous page etc..

I think this would be great.
It seems to be getting a good response on the t600 page.