Does a crowdfunding site like kickstarter.com exist, which accepts bitcoins instead of dollars?
For donation-based crowdfunding:
and some day coming back:
Of course, the "equity" markets for equity-based crowdfunding:
And a forms of microlending from the crowd include:
[Update: Thanks to others answering this question as well, I've updated this list with their input as well.]
Lighthouse is an excellent decentralised crowdfunding app by Mike Hearn (one of the Bitcoin Core / bitcoinj devs).
Another option, buy/issue shares or bonds: Cryptostocks.com
http://www.bitcoinstarter.com hasn't launched yet, but it does have a webpage where you can submit your email address to be notified when it does launch.
nestorbooster is a crowdfunding site for board games. They accept Bitcoin payments.
I built https://fundhub.org/ for crowdfunding software, no fees :)
We received a lot of requests for this, so we built a Bitcoin extension for IgnitionDeck: http://ignitiondeck.com/id/bitcoin-crowdfunding/
This way, you can use Bitcoin to crowdfund on WordPress.