I think you can learn a lot more by figuring out how to offer constructive comments on other people's pictures than just throwing up a lot of your own for others to talk about. The reason is that the former action forces you think critically (even if you end up not posting anything), making you better able to critique your own work on the fly, whereas the latter can throw up all sorts of excellent responses that "go in one ear and out the other).
I check the site frequently. If there are a lot of new posts, I tend to skim through and only check the ones I have already been involved in (hightlighted in green), although I also use the RSS feed option to provide an easy way to at least glance at the first post of every new thread (not least so I can jump on oversize pictures and squash them down to size
)
Wulf