IM AN AFFILIATE WOOHOOO!
ie, something obviously not a direct link.
I've heard that URL shorteners can carry penalties....
So what I do instead is use
YOURLS: Your Own URL Shortener
(its free and open source!) You can install it on your own domain or even in a subfolder.
That way, I can use my own domain to create redirects.
'course, if you want a bunch of free ones, consider those listed at
URL Shortening Services, The Ultimate List - Hongkiat
WP users can consider: