As mentioned on Boingboing, Ambient Devices makes a nifty retro-esque system for displaying realtime data in a traditional 'analog needle' mode.
The 'Dashboard' consists of 3 analog meters with replacable backdrops. It receives it's data via FM subcarrier, configured via a web browser. You can go to their site and tell your unit what you'd like to display. Current stock market values? Temperature outside? Amount of traffic to your website today? All of these can be represented in realtime.
The Wireless Weblog has a full review of the unit, including information on the subscription service and everything. Just plain neato.
[Edit 11:58am - Sorry bout that, bad tag in the image. Fixed. -dbs]
The LJ feed of this post has broken HTML markup in it.
Actually, the original posting has been fixed, but LJ refuses to pull the updated version in the feed. Very annoying :(