A always one of the best sites to find collections of tutorials (or galleries of great photo’s) is Smashing Magazine.  They have a collection of 50 Photoshop tutorials for photographers which include;

Another great article on Smashing Magazine in ’70 Beauty-Retouching Photoshop Tutorials’, featuring;

Hongkiat have a collection of over 30 tutorials which are more about manipulating photos rather than just ‘touching them up’.  Different movie poster styles, light effects and using vectors are all covered in this collection.

Smashingapps are another site that often feature great collections of both tutorials and galleries etc.  One such collection ‘50+ Truly Useful Photoshop Tutorials For Amazing Photo Effects‘ covers, amongst others, these great tutorials;

‘26 Professional Photoshop Retouching Tutorials‘ on Six Revisions is a great collection of tutorials which concentrate enhancing models in post processing, from skin to eyes and bust to hair, pretty much every art of the model is covered!

Basic Photo Retouching In GIMP covers many areas of the technique in one article.

Resource websites

Resource ‘Tweeters’

Check out these lists of photographers on Twitter for inspiration;