Is there a way to backup Evernote to Dropbox? I was surprised that your solution works since wouldn't the Evernote database file be open all the time and Dropbox not able to sync it? If Evernote wasn't running certainly this should work like a charm.
Is there an application like Connectify for Mac OS X Lion? This answer shouldn't be marked as the accepted answer - the OP is asking for a means of sharing the machine's wifi connection. The method mentioned in this answer only works for wired connections.