On an iPad or iPhone? I checked the App Store, no apps to block ads. I wish they would just use ads that are relevant to the site like they used to. On one of my own websites, I have ads and you can choose what ads to display, instead of these random ads or ads for sites you just visited...

A simple google search for "Block google analytics" and "Safari" (yes, IN quotations) brought this up. Blocks both Analytics and Adsense. Don't think it blocks ads, though.

http://www.orbicule.com/incognito/