... stumbled across this site the other day ...
http://www.hidemyurl.com .... you get to test your site (i needed to get into yahoo mail) and it worked for me so i paid the $30 for a year ($2.50/month) ... you get an online account ... all web based NO software to install ... NO settings to change ... seems to be working for 95% of sites ... i have had some issues with heavy JavaScript sites but thats about it ... looks like a winner ... they also offer
http://www.hidemyurl.com:900 ... websense and st bernard are only looking on port 80 ... so they block
http://www.hidemyurl.com in websense or st bernard port 900 will still work ... as long as their IP is not blocked at your location it should work just fine ... i was using megaproxy.com but this is BETTER and CHEAPER
they even have a free service that is better than anything like tinyurl.com ... you can have custom link endings and EXPIRE your link ...