Possibly the best source online for great design tips is Smashing Magazine. I love reading their articles, and have one or two of their books in my collection.
Today, via Digg, I found another excellent article full of great Photoshop techniques, tutorials, and tools. A lot of these are excellent for the web designer who just can’t seem to get the hang of modern design, and I encourage you to check them out if you’re in to that sort of thing.
So head on over to Smashing Mag and read the full article.