Track Federal Register Rules and Comments Closing with GovPulse
GovPulse.us is a fantastic new app that puts "the Federal Register at your fingertips". The front page gives you lists (with links) of comments closing and opened in the last 7 days, followed by rules taking effect and proposed within that time period. Also on the front page is a map of your area with links to other FR entries mentioning cities/towns within a 50-mile radius of your location.
Here's a screenshot of the neat map feature: