If you do a lot of buying on eBay, going through the standard interface has some limitations with the most obvious being that you have to refresh the page to get the most up-to-date bidding information. To overcome this limitation and introduce new functionality not available via the web interface, check out eBay Desktop.

Features:

• Access eBay through an application, not your browser
• Search feeds, item reminders, and persistent filters put you ahead of the game
• Recent item cache, outbid alerts, and no need to refresh

Note the last feature: outbid alerts and no need to refresh. This is huge for obvious reasons as you can now stay on top of the auctions you are watching.

eBay Desktop works on Windows and Mac, so if you bid on eBay often it might be worth a look.