Submit new proxies -
Well yeah, I didn't mean to imply that it's totally useless.
But in the scheme of things, PageRank isn't really that important. I'd rather have a high-quality site and a steady stream of visitors than worry about whether or not my PageRank is a 4 or a 5, you know? What I mean is that PR shouldn't be a priority - there are more important things.
In my recent experience the directory submissions help. Here's a couple of recent threads that you can find more discussion on the topic.
Directory Submissions -- Results?
yes this best way to improve yyour site in google. I have good experience in directory submission. But do quality directory submission.
Depends on each individual directory your submitting too really and if its still being actively promoted by its wbmaster. Some people like to start one (or start too many at one time) and forget about em or just plainly get bored with them. But eitherway submitting directories definitly cant hurt the cause.