It all started from Star Wreck (basicly 0 budget) Ok it took about 7 years to complete film, but in that time people get iterested in it.
And then they shared it for free in web. Fans get change to donate it. (Soon it become maby the most wtched Finnis film ever)
http://www.starwreck.com/
And with its huge succes they started making Iron Sky (budget of about 7.5 Million Euros). From the start they use socialmedia and others to collecet
mony for the project (crowd funding) http://www.ironsky.net/site/support/finance/
http://www.ironsky.net/site/
And here is latest Iron Sky Update: A Behind the Scenes Video Interview. Here you can her how important (new idea crowd funding) really was.
http://constantin.glez.de/blog/2011/12/iron-sky-update-behind-scenes-video-interview

Read those webpages and find how they use socialmedia and others to get funding.