One of the things that I like to think about when on (and off) the bike is just how to pare down and focus my own bike fleet so that it serves my needs as well as possible with as few bikes as possible.
This sort of thing sometimes leads to interesting mental exercises. And sometimes it just leads to the appreciation of someone who has done just that. Earl, one of the fine mechanics at Revolution Cycles (my LBS), has unloaded most (or all?) of the rest of his bikes and now rides two Pugsleys (ketchup, mustard).
These two Pugsleys (one geared, one singlespeed; both with offset forks) and two wheelsets (one 29+ and one full-fat) yield six configurations that cover all of his needs. You can read more about it at Revolution Cycles.
This is just the sort of thing that I’d like to end up with myself. And while I doubt my configuration would end up looking the same (I love riding on the road a little too much to go with just fat-bikes…maybe), the well-thought-out collection of just enough bikes and just enough options to suit his needs is what makes Earl’s setup awesome.