You Ready To Go Gung HO? A Hotshot Challenge
We've learned how to build our own jQuery, and excluded the maximum number of components, so at the time of writing, there isn't much more we can do.
If you're reading this after version 1.9 of jQuery has been released, there may be more components that you can exclude, or other techniques for building jQuery, so to really cement your understanding of the build process, build a new custom build that also excludes any new optional components.
If there aren't any new optional components, I'd recommend you to spend some time writing QUnit tests for any custom scripts that you've written. The idea is to write a test that replicates a bug. Then you can fix the bug and watch the test pass.