I am addicted to Photojojo.com. Today they are offering up  "No-Nonsense, Jargon-Free Guide to Sharpening with Unsharp Mask".

Photoshop toots* not your cup of tea? Check these posts out:

• Play Nicely With Others: Games to Play With Your Camera
• Mysterious Photographic Time Machine Found In Japan
• Long Portraits

(toots = tutorials)