In these days of low-cost storage, I don’t often stop to think about the size of an application any more. Even the real monster apps don’t eat that much space; the real exception on my computer is GarageBand, or more particularly its huge collection of loops.
Tonight I stumbled upon a site I used to frequent years ago, back when my Palm III was still in use and I had to make every bit of its meagre 4MB (or was it 2MB? I can’t remember now) count.
That site is Tiny Apps, a minimalist site for “very small software”; and it even has an OS X page. So if, unlike me, the size of your apps still bothers you while running OS X, perhaps you might find something interesting to play with there. Assuming you have enough disk space.