Once you've mastered the rules of federal civil procedure, you may want to read more about new interpretations and/or proposed changes to them. There are some good blogs about federal civil procedure. A few of them are listed on this page.
Additionally, it's an good idea to check out the Curent Rules of Practice & Procedure on the United States Court site to make sure you are using the most recent version of the rules. You might also want to check on Pending Rules Amendments.
This blog is an excellent resource for keeping up to date on issues related to Federal Civil Procedure and Federal Courts issues. One of the co-editors of the blog is Brooklyn Law School professor Robin Effron.