Why GIMP is Inadequate
I expected this to be a rant or flame, but in fact he has described wonderfully what needs to be said.Besides from all this pro features that GIMP lacks, in my opinion its biggest flaw its the UI. Its poor and raw, and makes sense if you are a programmer... 
Mainly this is what keeps it far from the regular users I know.Hope It doesnt die, its a very good open source multiplatform editing tool...