The way that they preselect an amount $1 above average is extremely clever. It appeals to people's need to see themselves as above average without costing them anything substantial. Screenshot: http://screensnapr.com/v/QciSbr.png
I'd love to be a fly on the wall for the A/B test, but I still think something a wee closer to http://images1.bingocardcreator.com/blog-images/hn/deep-disc... would kill both the A/B tested options. Bringing in people's psychological need to be above average is great, but I might do that by putting a nice 37Signals style yellow highlight on one of the expensive options (for some value of expensive which would pay for…
Also the fine-grained payment distribution scrollbar controls make me feel empowered and better about my participation in this cause. Getting rid of them would disappoint me.
This reminds me of someone's donation button on some open source project, it was something like:
Donate [$5 — buy me a beer] [$20 — buy me dinner] [$100 — buy me a gadget]