Will Colston from GovExec sent me an interesting email.
http://www.nextgov.com/ , part of the Government Executive Media Group (which is part of Atlantic Media Co.), has put together an aggregated feed government agencies Tweets, so you can see dozens of agencies tweets at the same time on one page. I already follow a couple of these agencies separately, so the "feed" is a great way to catch a quick glimpse of many agencies with one click. The link is
take a look.