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fast and dirty..
assuming you are using winxp..
Start -> Run, then type:
notepad.exe C:\WINDOWS\system32\drivers\etc\hosts
then add the site you want to block like this:
127.0.0.1 www.tranceaddict.com
add as many of sites as you want, each on a new line and just change the hostname. Depending on how badly you want to procastinate, you may be lazy enough to not edit the file to visit the sites again and considering firefox's long dns cache, you won't see changes right a way so you will also have to restart the browser or wait a while. Should work for ie as well although shorter dns cache.. 
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[alk]
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