I recommend photoshop.
I RECOMMEND YOU DIE (lol just joking, GIMP is FREEEEE)
QUOTE(FAST6191 @ Sep 23 2010, 05:57 AM) Tutorials I tend to find as and when I need to learn a feature.
Step 1 with proper image editing is learn what layers and how to use them.
Step 2 is lean selection options and how to use them (especially in conjunction with layers)
After this everything is so much point and click and memorisation of keyboard shortcuts (shift for straight lines sort of thing).
Some stuff is covered in
http://docs.gimp.org/2.6/en/ although it is more of a reference manual than I am new to image editing which is probably better covered by
http://www.gimp.org/tutorials/
Similarly many of the photoshop tutorials do cover image editing in general so have a look there as well.