If you use Apple's iCal calendar program or Address Book application on the Mac, or Microsoft's Outlook or Outlook Express on Windows, each time you sync your music, you can also update your contacts and calendars.
Your iPod can store a lot more than just music. You can also use your iPod as an easy way to store and transfer large files by putting the device into iPod Disk Mode. Here's how, using iTunes 7 or higher.
Make sure that "Enable disk use" is checked (highlighted here in green). This will let your computer treat your iPod just like any hard drive, CD, DVD, or other removable storage device.
Apple's free iPod Updater software could lengthen the life of your iPod battery. A reader with an iPod battery problem went to Apple's Genius Bar for help: