Why doesn't it work with all sites?
SitePouch.com works by placing each web page into frames. Unfortunately, a few websites (such as Twitter) do not allow their sites to be framed. If you add one of these sites, their website will simply replace SitePouch.com.
Unfortunately, there's no easy way to recognize these sites before creating your site pouch. If one of your sites replaces SitePouch.com in your browser window, this means that site will not work with SitePouch.com. Sorry!