Joe Workman put out a utility today for sharing Application Support folders between machines using Dropbox. It uses symlinks to allow moving the folder out of ~/Library/Application Support and into your Dropbox but keeping it accessible to the application. This is a great trick, and the Joe’s utility makes it dead simple to pull off. The biggest concern, however, is the possibility of corruption and other issues if you run the application on multiple machines simultaneously.
This is a companion discussion topic for the original entry at https://brettterpstra.com/2011/08/30/dropbox-and-seamless-mutli-mac-computing