Also, smashingmagazine.com frequently has good links to tutorials.
I found this Smashing magazine tutorials rather useful http://www.smashingmagazine.com/2007/03/10/web-20-tutorials-....
You can also find some gems on Smashing Magazine's site http://www.smashingmagazine.com - while not photoshop specific, there are some good articles like http://www.smashingmagazine.com/2008/01/10/adobe-photoshop-t...
My advice to you, if you're creating any type of logo, start downloading fonts like crazy. I recommend a site like www.dafont.com (unaffiliated.) The reason? you can find very interesting graphic elements in wingding-type fonts and you can scale them to any size.
If you're willing to pay, www.lynda.com is great.