Adobe has a rich collection of video tutorials on Adobe TV and a channel dedicated to Digital Imaging. www.tv.adobe.com. Here are some that aren't to be missed:

• Everyday Timesavers Series: Photography with Julieanne Kost
  Six videos exploring how different functionality in Photoshop CS4 and Lightroom 2 save time and make your workflow more efficient.
• The Complete Picture with Julianne Kost  
  This series of 12 videos does an in-depth exploration of Photoshop CS3, Photoshop CS4 and Lightroom 2 features.