Just came across a pretty cool tool.
A ticker that constantly scrolls on your the top of your browser showing domain names for sale or at auction at sites including:
Sedo
Afternic
DNForum
Pool
NamePros
SitePoint
If you are interested on a domain you see scrolling, you can just click on it and it will take you the site, so you can place a bid.
The ticker is free, works with Internet Explorer and Firefox, and you can download yours at: