Hi,
I wrote a web app in Rails for collecting system statistics from Sparkle, I've been using it for a few years to collect Sparkle profiling stats from my app Gitifier, and now I added a UI there that presents this data with some nice graphs. I made it open source so that other Mac app authors can use it too. I figured you might be interested since Handbrake also uses Sparkle.
Here's the project: https://github.com/mackuba/sparkler
And here's what kind of statistics it can generate after some time: http://sparkle.psionides.eu/feeds/gitifier/statistics
Sparkle statistics
Re: Sparkle statistics
Moved topic to Tiki Bar (from Mac Support).