I stumbled across a computer lab that has 10.5 Leopard installed on two of its computers(!!). Definitely 10.5 and not a bunch of skins/plugins, because About This Mac confirmed it. Of course it must be a developer build, and it was probably the first one because it was before the dock got that "crosswalk" separator thing. I'm pretty sure this is illegal? Anyhoo, so I finally got to use Leopard and to be honest, it's not that huge of a change from 10.4 so there wasn't a lot to WOW me. The different Finder look was about the biggest change in usability, which isn't huge. Also, the little blue "gem" thing that now appears in the dock for active applications instead of the little black arrow was VERY hard to see, I thought. Anyhoo, enough with my complaining, that wasn't the point. Just seems very illegal that they have this running publicly on two computers!