I'm using that one too for the eBay Partner Network. Any chance that you could make a parser for that as well? I know there's another one here but it only parses after the fact, I like the way that yours is coded.
This looks extremely useful but your examples adds 0.7 seconds to the page load. Isn't that quite significant?
In a more real world example, but probably still more that usual, 10 links on a page gave me these numbers, no other addons, with debug on, and link proxying on:
Timing: 0.3625 seconds Memory: 9.547 MB DB Queries: 10
Timing 0.3782 seconds Memory: 9.432 MB DB Queries: 10
So, not an exact science (localhost machine, not cache configured, etc.), but for 10 links on a page, expect a .0160 second increase in page load(?). Not sure why the memory usage would be lower with the add-on installed, but I'm sure there's some xf caching or other mechanisms, or crons running that affect that.