Thanks Kimbo - is that on all users, regardless of their location?
edit - based on the declared locations of all posters so far in this thread, you should be seeing 3 in UK, 1 in USA, 1 in Thailand .... not all in UK.
I suspect the country code in the start of the URLs is an automated call from the users IP address, setting their (same country) ebid server to access the rest of the URL. As I'm in Thailand, and there is NO th.ebid.net, it's simply giving me a http:404 and dumping me to the highest level site page.
Wakey wakey G&M - This can do you some serious damage with Google for delivering so many 404 errors - remember I'm a multi-site webmaster too, and use a lot of Google webmaster tools and forums. Even just me clicking links in here and getting dumped to the home page is going to start affecting your page deliverability ratio. Google doesn't like that to get too high before they start slapping you.
Gaz