Actually, found the blog article: it's 46% in 2011 (43% in 2010), but whatever: http://www.kickstarter.com/blog/2011-the-stats

That's actually just the percentage of projects that hit their funding goal. There is no indication of what percentage delivered.

I suspect someone could figure this out. To my knowledge, all funded projects still have accessible pages. You could go through them all and see which have updates that indicate shipping...

Ahh, I believe you're correct. I optimistically read those stats...