In my latest piece on ClickZ - What Can Fix The Broken Ad Model? - I discussed SkipIt, a new service from SpotXchange that allows individuals to bypass those "arrgghh" moments where they are forced to watch a pre roll video before their content! An interesting move from a video exchange.
Following their launch, the IAB announced support and standardization for skippable ad units, as covered here by AdAge.
Thinking of skipping, also check out this guide on stone skipping from a pro stone-skipper of all things ,as reported on the SkipIt Twitter feed.