Web page browsing speed drastically slowing down

I purchased a 13 inch mac book pro in December. Since day one, I have had a problem with my web page browsing speed drastically slowing down. These crippling slow down periods are completely random. They can start any time, and last from any amount of time. from minutes to hours.
95% of the time any attempt to load a page end in a time out. The other 5% takes no less then 90 seconds to load the simplest of pages. I have this problem no matter what browser I use (Firefox, Chrome, Safari, Opera). What is driving me nuts is other applications work fine when browsing slows down. Skype, IM clients, multi-player games all work great, but web pages will not load. When I ping a website, my latency returns are perfectly normal. I can use Telnet and SSH with no problem.
This has become such a problem that I can not depend on using OS X day to day. I used boot camp to setup a windows partition and installed win 7. Using my win 7 install everything runs perfectly, I have had zero slow down!
I've done some searching and found numerous posts with similar problems. Ive read and followed the advice that I found, but I've had no success is fixing this.
I have had this problem on 6 different wireless networks. Each time this problem has come into play, my windows install performs flawlessly. This really makes me belive this is a software problem. Not hardware / ISP.
I see alot of post blaming default ISP DNS servers, just to let everyone know I use google's open DNS on my home network.
I also have changed the DNS settings in OS X
All other machines on my home network have zero problems!
Sending files between my laptop and other machines on my network works perfectly.
I have found a few posts / guides for using OnyX, none of them have worked for me
I have to be missing some simple thing here, any help would be greatly appreciated.
Message was edited by: BinomialHeap

Thank you for the welcome and the quick response Glynn
I rebooted into OS X as soon as I read your response. Web pages would not load.
I followed your instructions.
The Airport Light was green.
I went ahead and hit assist me and ran the diag tool. According to the tool my internet connection is working correctly.
Sadly the problem persists and web pages still will not load in all four browsers.
I ran a ping to google.com and responses were well under 45 ms.
Message was edited by: BinomialHeap

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after 15 minutes=5.67 Mbps
after 30 minutes= 5.59 Mbps
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after 30 minutes= .60 Mbps-ping takes 250 ms
1 hour= .46 Mbps-ping takes 250 ms
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