Your blog http://gpapps.com/ is not hosted on Posterous.
This is unrelated to the discussion at hand.
This is unrelated to the discussion at hand.
It actually looks like WordPress is doing the same link affiliation as Posterous. They're using Skimlinks, not VigLink, but the result is the same. (Open a javascript console while on your blog and take a look at the skimlinks function.) FYI, Skimlinks is based in the UK. That probably explains why the original apple.com link bounces through euro.apple.com.
As easy as it is to miss, I bet there are a lot of sites doing this now.