MacDropAny: easy Dropbox syncing for any OS X folder
With MacDropAny, you just run the app, pick a folder to sync, and pick a location in your Dropbox where the symlink will be created. Boom. Your local folder is now syncing to Dropbox. You'll have to run the app multiple times to sync additional folders, but it's the fastest solution out there for anyone who's not a serious command line jockey.