In the contexts where the atom feed link appears, it's nearly always on a page where all the other links are capitalized, which makes "atom feed" stick out like a sore thumb. Let's change it to "Atom feed" -- or, even better, replace it with a little feed icon (with alt text, of course).

All over the site, we have exhortations to users to "Submit media", "Submit an item", or even "Submit yer media!".

First of all, the inconsistency (all of these links go the same place!) is silly. Let's have a standard usage in site copy, and if variance is needed, we can justify that later.

Second, I've never liked "submit" in web copy. At best, it's rather formal programmer-ese. At worst, it carries a whiff of authoritarian control ("YOU WILL SUBMIT"). Neither of these matches the tone of the site.

What do we think of, say "Add [yer] media"? Or even "Add pictures" -- we may as well be specific, we don't support anything else yet :P

It's not obvious whether tags are comma-separated or space-separated, just by looking. Let's add a little bit of text to make that clear!