What would help keep track of developers? An RSS subscription system perhaps. Picture this... you fire off an email to: email@example.com. A script on the email server parses the subject and body of the email and transforms that into an RSS item with TITLE and DESCRIPTION which gets added to your personal RSS feed. Your manager/project manager then subscribes to developers or other employees personal feeds, open a browser based RSS reader and get a quick update on who is doing what.
Not only could this be valuable to individuals but projects as well, subscribing to project RSS feeds internally to see what is actively being done on your project. How about for large companies like Yahoo, Google, etc where developers probably have no idea what each other is up to. How cool would it be to subscribe to developers RSS feeds in another city to see what other people are working on.
kinda like this mock up http://meetoc.com/temp/emp_rss/