Swipe to Search
However, did you know if you keep pulling down on the screen in your email inbox and hold down for a while it will reveal the search function that you thought Nokia left out? I was about to blog on day one that it was weird that there is no search bar for the inbox but on closer inspection, this search is not only there, but its very fast! Whatever algorithm it is using, it seems to have learnt something from Gmail.
Swipe to Refresh
In the Facebook application, swiping down from the middle of the screen in Notifications activates "refresh".
Swipe up to Quick Launch
In any application that you have open, you can jump to the Dialler, Messaging, Camera or Web by swiping up a little from the bottom and holding it mid way.
Hope that helps.