Great script. Love the concept. Makes items that have been bidded on stand out fantastically.
Only one bit of critisism for you..
// @name eBay - Hilight Items With Bids
// @namespace http://userscripts.org/users/126140
// @include http://*.ebay.com/*
As there is many extensions for ebay, you should change the "@include" to.. "http://*ebay.*/*"
Installed fine on ebay.co.uk, shows up listings very clearly. Top work!