Jakob Heuser wrote to let me know about this big meaty blog post describing how he and the other folks at Gaia Online have implemented an impressive just-in-time CSS and JavaScript loader based in part on LazyLoad.
They've made some very nice improvements (such as replacing LazyLoad's queue-based loading with method chaining, which ends up being much faster) and fixed some bugs, all while keeping the library down to a slim 5.6K (minified) without any external dependencies. Very nice.