FeedBurner, which is establishing itself as the RSS management leader, has raised some more private equity by bringing on Union Square Ventures. No financial terms but FeedBurner said total fund raising is now more than $10-million - it appears Union Square was brought on as a strategic investor since FeedBurner may have not needed the cash. FeedBurner CEO Dick Costolo said the company is now delivering 10 million subscriptions and 200,000 feeds a day. A growing part of the growth, he said, is coming from corporate publishers such as USA Today and Reuters who have realized RSS is not a short-lived trend but another way to distribute content.