Andrea & I have been working with the Genesis Theme Framework since it was in alpha. In fact, the theme on this site is Genesis and a customized version of Delicious. To date, I have mostly been working on GenesisBuddy (BuddyPress support for Genesis & Genesis child themes).
Over the summer, the folks at StudioPress have been releasing plugins to extend the functionality of Genesis. A couple weeks ago we were having coffee with Rebecca and she mentioned that another handy plugin for Genesis would be a menu plugin like Genesis Simple Sidebars. Since I agreed that would be a handy plugin, I wrote one that would do just that.