Kottke has a great analogy for blogging:
As businesses go, blogging is a lot like shining shoes. There are going to be very few folks who own chains of shoe shining places which make a lot of money and a bunch of other people who can (maybe) make a living at it if they bust their ass 24/7/365. But for many, shining shoes is something that will be done at home for themselves because it feels good to walk around with a shiny pair of shoes. Everyone else will switch to sandals (i.e. Twitter) or sneakers (i.e. Facebook) and not worry about shining at all.
