kelbytraining.com (calvin hollywood) and lynda.com are some online options in addition to the DVDs from mayhem members (plus gry garness).
partly i think it depends on what you're doing. if you need something quick&dirty that can be done in a few minutes maybe just run portraiture and do a little spot healing. portrait professional can be interesting for headshots (used that on a realtor last week) and onone now has something similar although i haven't tried it. if i have to spend several hours on something i may be better off outsourcing that to a pro.
I've decided to delve deeper into retouching recently, so my advice might be helpful or it might really suck, haha. I have found kelbytraining.com to be very helpful starting out. A lot of their videos are very basic but there's also a lot of good stuff mixed in. I just did a month subscription and watched all the videos I wanted then canceled. Jot down some notes!
Right now I'm doing Lynda.com. It's like Kelby but has a few more technical tutorials. Plus they have tutorials for all kinds of other stuff. I'm doing an SQL one for my day job! I've also found Gry Garness Book and DVD to be awesome. It's a bit of a dry read, but very informative. Slowly getting through it
I found Mastering Retouching by Nick Saglimbeni to be a waste of time. Glad I borrowed the disc.
Natalia Taffarel on these forums gets a lot of praise for her DVDs. They are on my "someday soon" list when I work through what I have and have some spare cash
WKC Todays Photography wrote: Looking for the best photoshop tutorial on DVD for retouch/glamour etc..
Check out Kelby Training, on that site there are a number of photographers who specialize in glamour, high fashion, etc. Calvin Hollywood comes to mind and there are many others. You can browse the site for free, it costs about $149 a year, but, for me, its been invaluable. Every subject on photography, photoshop, lightroom, and every subject one could photograph. A couple of years ago, I was asked to shoot a concert, had never done one before and I was told by the venue that I had two songs to get all the shots I needed. KT showed me how to do it, what to photograph first, a logical shot order and the results were great and I've been asked to shoot 3 other concerts since.