Here is a method to quickly sync your .bash_profile between machines using DropBox in OSX.
$ cd ~/Dropbox/ && mkdir profileSync
$mv ~/.bash_profile $ln -s Dropbox/profileSync/
$ln -s Dropbox/profileSync/.bash_profile ~/.bash_profile
The only other app specific files I’ve synced before were Textmate bundles. If anyone else has and recommendations please comment.