Cure for procrastination!

Hi, is there any good software that can help me stop procrastinating? For example, I'd like to set up a countdown timer. When setting up the countdown timer, I tell the program to block access to internet addictive pages such as eyesonff.com, and programs, etc APART from Word. Then when the countdown timer is done, every access will be restored back to normal.

I really need it because I always procrastinate =[ I get distracted easily, my school works are based on computers which makes it harder not to procrastinate.

Thanks in advance.

EDIT -

I found one software
Download User Time Control

But I'd like to know if there's any better ones, thanks again.

If you use firefox and want to just block internetting, then you can use the greasemonkey extension to great success, I think.

Featured Greasemonkey User Script: Fight procrastination with Time to Go - Lifehacker