Read this:

So imagine a flat X-Y plane – any floor will do – that's a map of topics in two space.

To illustrate a little, let's stand on the map at 'environmentalism'. Somewhere near we can see 'Lomborg', 'ANWR' and 'Kyoto'. A little further off in the direction of the latter two is 'fuel cell' and in the mid-distance behind is 'Saudi Arabia.' 'Anime' and 'Reality TV' are lost in the haze, in an unknown direction.

Now, up off the ground, and let's add a Z (vertical) axis. This axis is attention.

Let's give every reader / viewer in the audience for our medium 100 poker chips, and ask them to put the chips on the map areas representing how they would ideally like to spend some time and attention this month, available content permitting.

Cue the special effects, and pour in the water.

Now let that water represent the fixed costs of entry in the print medium, restated as the amount of attention you need to monetize to survive. You'll notice most of the landscape is now underwater. So are the business models of those on the small peaks.

Now, back to the blogscape again. Drain most of the water – fixed costs are way down. Even many of the smaller hills are dry – making money – if only indirectly as a form of virtual advertising. The diarists are still underwater, but the snorkel is pretty cheap. There's also a lot of life on the lower slopes of the big peaks, more microclimates and ecologies to exploit.

No, it's not me talking but Tim Oren ranting on the naivety of the Power Law (warning: over-simplified).  He is doing a Don Park as in Don't Park and Think but Drive Right Into The Damn Picture thing.  I really enjoyed this post, particularly the pouring and draining of water.  Tim forgot to add the part about zooming way out to reveal the map as the skin on a drum on which the Hands of Time beats on constantly.  Heh.