I've actually skimmed over most of the 240+ page user guide that Verizon has online and learned some cool stuff from that:
- To switch between active apps, press and hold the Home key (this is sort of the equivalent of Alt+Tab in Windows) and it will show you the active apps
- You can create folders in the same way you add a Widget, just select Folder instead. You can then rename the folder by opening it and then pressing and holding the title bar of that folder. To drag things into it, click on the up-arrow just above the Home button, find the app you want to add to a folder, press and hold it and drag it to the folder in which you want to place it. This is a feature that I hear iPhone users don't have and would like.
- Get the Locale app - it's amazing. You can have your phone automatically change various settings based upon your location as determined by the GPS or by time of day and/or day of week. It's one of the few true must-have apps.
- To move Widgets and shortcuts around your home screens, just press and hold them until they get the green frame around them and then you can remove them or drop them where you like.
- To remove applications, go to the MarketPlace and choose Manage Applications (or Downloads, I forget which). Touch the app to remove and remove it. It stays in your Downloads and can be re-added later if you'd like.