I love a good idea.
When Sally 
Bartz of 
Halsea and Mindy Gayer of 
Cotton Idea Studio decided to team up and open their businesses under one roof, I thought it was genius. With Sally's travel bags in the front and Mindy's stationary and 
accoutrement's in the back, the two 
entrepreneurs share customers, store hours and often package their items together to make gift giving an easy grab-n-go kind of thing.
Jan Norman of the Orange County Register picked up on their story and just wrote a great feature about it, complete with photos. Check it out here:
http://jan.freedomblogging.com/2009/06/14/money-saver-two-shops-in-one/15887/sally-bartz/