I've put money into a lot of Kickstarter projects, and I finally got around to doing a summary as to what I've spent:
2012:
19 projects, total of US$3,295 pledged (however $194 was to projects that failed to reach target)
- 2 failed to reach target
- 6 received
- 11 are in clear progress or otherwise still seem likely to ship (several are in progress of shipping or have delivered early parts [eg, ebook before printing])
2011:
17 projects, total of US$1,943 pledged (however $10 was to projects that failed to reach target)
2010:
5 projects, total of US$1,177 pledged