Do you have WAY too many passwords to remember? We at TweakMyDevice sure do, so we recommend using KeePassDroid on your Android device. Set up one master password to easily access all of your secure data.
Titanium Backup creates a backup of your installed apps to the storage card. Keep a copy of the backup on the Cloud and your PC in case your device is erased, lost, or destroyed. Also if you perform advanced tweaks like ROM flashing this is useful for an easy setup since a lot of custom ROMs have issues repopulating apps from the Android Market.
Want the look and feel of a new Android Tablet without shelling out all the $$$? Honeycomb is the newest version of Android designed only for Tablets. Follow this tutorial to theme your Android smartphone with Honeycomb!