By way of the upcoming TechCrunch “un-conference” style demo-brainstorm-fest Wiki I came across a blog post by Michael Arrington titled: Top 5 Web 2.0 VCs. Here is the entire list (Top 5, Notables, and Up and Coming) extracted from the post (see my linkblog page to get some insight into the motivation behind this post):

David Cowan is a partner at Bessemer Venture Partners and writes a blog called Who Has Time For This. He’s on this list partially because he incubated the hottest and most anticipated company on the web right now, Flock.

Tim Draper invested in Skype. Done. He also sits on the board of SocialText, and his fund was in Baidu.

David Hornik is is a General Partner at August Capital and writes a blog that has over 10,000 RSS readers.
Josh Kopelman, through FirstRoundCapital, is quietly filtering through just about every young web 2.0 company, and investing in many of them.

Fred Wilson is a founding partner of Union Square Ventures and writes the extremely popular A VC. If you are new to web 2.0, start with his Blogging 1.0 post.

Jeff Clavier - Jeff is a former VC and still makes the odd angel investment (Feedster, Truveo, and a few others). His new venture allows him to work with pre-funding companies and get them ready for prime time.

Brad Feld - Brad is a managing director at Mobius Venture Capital and writes a must-read web 2.0 blog called Feld Thoughts. Read his posts on Term Sheets if you are in the process of raising capital.

O’Reilly AlphaTech Ventures - This is the only non-person on here. OATV just closed a $50 million fund to invest in young companies. Given the incredible access Tim O’Reilly has to these companies, OATV could quickly become an important fund in the web 2.0 space.

Pierre Omidyar - Pierre founded ebay and is the Co-founder of Omidyar Network, where he’s invested in a number of interesting companies including EVDB, SocialText and Feedster, and others.

Peter Rip - Peter is a founding partner of Leapfrog Ventures, a $100 million fund. Peter also writes Early Stage VC, another must-read blog. His investments include ojos, an incredible new photo-metadata service that is going to be extremely disruptive (and useful).

Peter Thiel - Peter, the former CEO of paypal, has invested in LinkedIn, Friendster, LinkedIn and other web 2.0 companies. He’s just created the Founders Fund.

Thomas Ball - Tom is a Venture Partner at Austin Ventures, a fund with $3 billion under management. He’s their consumer and web 2.0 guy and seems to be spending a lot of time in Silicon Valley and at web 2.0 event.

Dan Grossman - Dan is a principal at Venrock Associates and has recently started a great blog called A Venture Forth (where he wrote a much bookmarked post on Ajax).

Jason Pressman - Jason is a principal at Shasta Ventures, a young $200 million fund that has a deep commitment to and expertise in consumer-focused businesses.