UPDATE––Old Article Below
I have developed a Safari Extension that uses the same basis for the MAS filters, but with improved performance across the web. Download it at www.bit.ly/adstopper
I don't know about you, but I used to use Yahoo mail (Gmail is better, so I switched to that). The most annoying thing about it is all of the weird ads all over it. And besides just Yahoo mail, when I am doing research for debate or looking up how to hack into people's computers--I MEAN how to hack (as in change/modify) a computer. ;D jk...but the ads can seriously get annoying.
With some serious research/designing, I created some Ad Filters called MAS™ (Mac AdStopper) Ad Filters that block most ads like the ones I am referring to (which is basically all ads on the internet).
They work very well, and if you are interested, email me (firstname.lastname@example.org) and I will send you a free copy. Instructions are included. Enjoy!