Jeremiah Grossman, Rsnakez0r, and myself put together a top web hacks of 2006 last year and this year we're soliciting public participation to submit what you think made the list for 2007.
From Jeremiah's blog
"As RSnake, Robert Auger, and I released in 2006, we’ll be putting together a Top 10 Web Hacks for 2007. The difference this time will be it’ll open to a public vote! Everyone will get a chance to weigh in on what they think the Top Ten for this year should be. Hey why not, it is an election year. :) To be clear the “hacks” we’re interested in are the new techniques released over the last year - we’re not talking compromises or “incidents”, but the real research behind it all. "
Details can be found at Jeremiah's site below.