look for thread "starting out"... in newbies
On top to the 4 you mentioned above [especially option 1 , score point with the CS elves...], i like the following too:
(1) is frequent by many active and rather distinguish people in the photography scene in the US. Very friendly site!
(2) is a Toronto based site... Quite a bit of things to learn from there... Check out the learner section at the bottom of the homepage.
Check this (3) for lens reviews... I has a lens review section where you can even compare 3 party lens across all the lens within a particular focal length... [by the way, its becuz of the reviews on this site that prompted me to buy the Tokina 28-70mm 2.8 ]