No, I'm thinking of something that needs to be smarter. As I said (or meant to say, if I didn't...), hiding the URL seems...wrong, since (snooty voice) hyperlinks are the backbone of the web. More seriously, while I'm one of the least-paranoid people when it comes to computer security, I rarely touch TinyURL links. It could lead to an article, a direct download, a virus-ridden page, an obnoxious video clip, or anything else (and if a hacker gets brief access to their table...?).
What I'm talking about is a hypothetical service that "knows" the structure of corporate URLs so that you get to the right page and it's obvious what you're pointing at, but all of the clumsy extra tracking information gets removed. You know, the session IDs, the referrers, and so forth. In fact, I've noticed a lot of TinyURLs point to nothing because of expired session IDs--they look fine to the poster, because they're still in a valid session, but nobody else sees it.
In the eBay case, it would isolate the item number (easily found) and build a new, clean link that points at that page, which is what I usually do manually when passing links around.