Shortened link
The link you followed has been shortened with is.gd. Shortened links can go anywhere on the Internet so you shouldn't continue if you got the link from a suspicious source e.g. junk email.
The full original link is shown below. Click the link if you'd like to proceed to the destination shown: -
http://duncanmackenzie.net/Blog/Nice-mention-of-the-upcoming-Xbox-360-for-Dummies-book-on-xboxtodayca
Tip: some QR readers fail to read mixed case URLs properly. We recommend using the lower case option or a lower case custom URL with QR codes.