Venture capitalists are going nutty over Web 2.0 companies, pouring $870 million into these companies during the first three months of the year, up from $786 million the quarter before, according to a new study by PricewaterhouseCoopers and the National Venture Capital Association.

Here is a list of all Web 2.0 companies that received venture backing. Download the list here; note the tabs at the bottom, which show all 2005 fundings, and then 2006 Q1. Scroll to right to see the funding amounts, etc. (Hat-tip to PwC for sending it on.)

However, you’ll see PwC defines Web 2.0 companies broadly. Their survey includes non-consumer companies, such as San Francisco’s Riverbed and Palo Alto-based Netli, two network infrastructure companies that many people wouldn’t associate with Web 2.0, but which PwC and NVCA included because they help facilitate the Web 2.0 experience, according to Tracy Lefteroff, the global managing partner of PwC’s venture capital practice.

Tracy said the next step for PwC is to try to separate the Web 2.0 consumers companies from those that are more back-end, something they may do next quarter. (Judging from the critiques of the list in comments so far, they may want to do this sooner rather than later).

Seven of the top 10 Web 2.0 deals were in Silicon Valley, according to the data, a high proportion that is eerily reminiscent of Silicon Valley’s hot affair with dot-com companies in the late 1990s.

“People are trying to contrast this with the Internet bubble, and want to know if we’re getting in the same risk category we saw developing in late 1999, early 2000,” Tracy told us.

“You always run that risk, but I still don’t see the frenzy to invest in these companies that we saw in the late 1990s.”

(Update: We think this is a great first-stab, but would like to help PwC make this list better. If your company is not on the list, and you’d like it to be, please leave info in comments. Or, if you are sensitive about the information, just email us at matt.siliconbeat at gmail dot com with VCW2O in the subject line and tell us under what circumstances we can use it (i.e., we can use the company’s name, and mention that it has raised seed funding, but we can’t list the exact amount, etc). Please leave as much info as possible, following the column headings given in the spreadsheet — scroll right to see the full headings. Note that PwC has put “confidential” for those companies that have requested anonymity on particular data. We’ll do same.)

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