Auction Informant tracks your eBay listings and alerts you via email, phone or pager when a new item is added or receives a bid or retraction.
One great feature of Auction Informant is that it can monitor multiple accounts at once. This is perfect if you're a power seller with multiple items going up for bid simultaneously. The program can also send alerts to multiple email addresses, so you can keep all of your associates in the loop.
Another nice thing about Auction Informant is that it works quietly in the background, sitting in your system tray until it needs to alert you of a new event. And, it will automatically update itself from the internet whenever a new version is available, so you always have the most up-to-date version.
Version 2.2.5: Fix for changes to eBay website.