The biggest drawback to using link-cloaking software or link-cloaking services (like TinyURL) is that they immediately draw the suspicion of the places where you advertize those links, as well as the suspicion of the people who might use them. To my mind, if you're trying to promote on a site that dislikes SFI links, just link to your own website or blog, give people more information on your site, and link them from there to SFI. There's no sense in annoying a site host.
