We have been producing the mainline kernel crack of the day for some time now. But this targets the upstream kernel, and while great for testing and bug isolation it does not provide us with any pre-upload testing on the Ubuntu kernel delta.
Enter the pre-proposed kernel PPA. We are now uploading the unreleased tips of the ubuntu kernel trees to this PPA. These builds will contain any bug fixes marked Fix Committed and should provide a vehicle for advanced testing of these before they hit the archive. For Maverick we will be uploading these automatically as the tree changes, roughly daily. This should help us avoid the ThinkPad debackle we experienced late in Lucid.
I would encourage you to add this PPA to your sources and help us test this kernel before we unleash it on the world.