We have Adobe Suite CS3. Adobe released CS5 last April. CS3 is a decent product. Adobe improved some tasks, for example edge detection which helps isolate subjects. (A student asked me about this today in class.)

Julieanne Kost, the Digital Imaging Evangelist at Adobe, is an excellent resource for Photoshop. She has an Adobe Blog too.

Russell Brown, the Senior Art Director, might overwhelm people with his ethusiasm. If his energy does not impress people, his knowledge most certainly will. Watch Russell Brown TV or read his blog.

You can also try Photoshop Tutorials. There are also sites on YouTube and many other locations.