So, you can't install anything on your computer without authorization from God, you can't access any other part of the internet apart from your office mail and of course you can't chat. Here's a novel idea, buy a flash disk and copy onto it, portable Firefox or portable Chrome for all your browsing requirements free from that demon Internet Explorer and VLC media player portable will sort out all your multimedia requirements. Get the full list of portable apps at portableapps.com. If you're a security freak, try anonymous surfing by copying TorPark onto your flash disk. If you need to read PDF files, try Foxit
This is of course, hit and miss. If your overzealous IT manager has red-bull and icing sugar for breakfast, this may not work. In his high energy zeal, chances are the blocking software he uses does a reverse DNS lookup - it maps the IP address to the web server.
Before you groan and zone out because I've used a word with more than ten letters that sounds "tech", bear with me for a few seconds. You have most likely used services like bit.ly, tinyurl.com or snipurl.com or likelier still, Google translate. These websites will operate as a proxy for you and since they aren't blocked on your network, this will result in (que Baptist choir here) success! Translate your page in Google from english to english and you may (or may not) be home free. This same approach will work using Yahoo's babelfish translation service.
Use Google Mobile, Phonifer or Mowser to browse the net. Granted it will look nothing like what you usually would see on your desktop browser, but it will be in a language you understand and more importantly, it will be ACCESSIBLE!
A quick and dirty hack is by going straight to your site via Google Mobile from your address bar by typing it like so:
Opera have made this method even easier. Opera offer an Opera-mini - their popular mobile browser - simulator.
Take that, overzealous IT guy.
If you have a gmail address and can't log onto gmail, or install the standalone client, try chatting using Google talkgadget. You can also copy Pidgin portable or Miranda IM portable onto your Flash disk.
Use websites like hide my ass to anonymously surf the internet. To the website blocking software, you are simply surfing hidemyass.com. Seeing as there's the term ass in hidemyass, this may get blocked by your software but there are tons more anonymous surfing websites out there.
I didn't know you could do this either until I began researching this topic. Just type in the IP address here and voila! http://Facebook.com appears as http://1161805072. The theory behind it involves black holes and quantum mechanics so I just glossed over it and didn't remember a single word.
So, in conclusion, please listen to your IT guy. He only wants the best for your boss who pays his and your salaries. And biting the hand that feeds you without at least ensuring the hand is sanitized might be bad for your health