This blog post is still coming up on Google before the Cupcake website, so I thought I would mention here that its back in the App Store and working for folks who had trouble before.

More info here: http://colorcupcake.com

Thanks, Brett for the write up!

I jumped on this immediately but a couple of us discovered that it didn't actually work due to Sandbox app/service signing requirements. The developer has pulled it until resolved but if you purchased already you should contact him on Twitter @cupcakeapp to get a beta version, which I can testify does work as advertised. Great app, keep an eye out for it's return!