I just put together a prototype for a client on Debt/Spending Ratios. I'm new to Java Script, but was a little surprised at how easy it is to pick up and apply to a very practical mobile interaction.
You can view the prototype here... http://chilp.it/2dc2268
I've also included the SL 360 file, because I've found that looking under the hood is the best way to learn. That, and I didn't want to spend hours writing a blog post with directions. ;)
Just a prototype, and thus a work in progress. But hopefully somebody can use it for a little inspiration. Share and share alike.