What are some good resources for learning Photoshop?

Adobe has a number of free resources (video tutorials, user manuals, etc) you may want to check out:

http://adobe.ly/iczlLh

Julianne Kost create amazing learning resources here:

The Complete Picture with Julieanne Kost

Adobe Blogs
Julieanne Kost and our development team blogs are a great resource, too:

Julieanne Kost's Blog
Photoshop Blog
Lightroom Journal
Photoshop Crawlspace

Twitter and Facebook
If you're a Facebook user you may want to follow these resources:

Photoshop
Lightroom

Or Twitter:

Photoshop
Lightroom

The Photoshop Community is full of many other great trainers and authors. Who are your favorites?