I apologize for finishing off the week with what may be a "well, duh!" item to some of you, but because I boot into the Classic Environment so rarely, the following is something I've not noticed before.
Under Panther (and, again, this may have occurred in previous versions of Mac OS X), when you launch Classic, the icon of the Mac OS 9 logo that appears in the Dock starts out as a grayish color. As startup of Classic progresses, the 9 in this logo gradually turns orange -- starting with the bottom of the 9 on up to the top.
In addition to this being a tasty bit of eye-candy, it's also useful if you've chosen to not view Classic's march of icons but would like some idea of how long you're likely to wait for Classic to come alive.