Any number of TUAW readers have tipped us off to dozens of Leopard Dock mods. Apparently nearly everyone using Leopard hates the default dock and the easy-to-mod docks make it simple to upgrade to something you like better. For example, here's one suggestion for a glass style dock, a dock color modder, a forum thread all about updating your dock and an entire site fully dedicated to Dock mods. If you'd like to read more, just google for Leopard Dock. Trust me, you'll find lots of hits.
Thanks to everyone who sent this in. You can stop now! But thank you all the same.