Came across this little gem today - a company called muesli mixer based out of Melbourne. They allow you to choose and mix your own muesli from 55 ingredients then home deliver to your door. Sure it's a bit on the pricey side (and from what I can tell, they're not the first to market with this concept) but I predict these guys are going to go gang-busters. Why? They've taken a simple idea and created an engaging online ("store") experience making it personal, convenient and fun along the way. They're being talked about a lot on blogs and in-press at the moment so keep an eye out.
