Eugene Volokh has an excellent post on how to choose topics for one's weblog:

My favorite hobby-horses are ones that (1) I know a lot about, so they require relatively little work for me (hence the not infrequent posts on various free speech issues); (2) I feel I have something new to say about (hence, for instance, the weird detour into the number of sexual partners that the median American male homosexual has), so that I feel my work would be worthwhile, and a pleasure; (3) require mostly armchair thinking based on stuff I already know; (4) strike me as unusually interesting; (5) come around when I've got relatively little real work to do, or a relatively great urge to procrastinate instead of doing that work; or (6) best yet, have as many of the above traits as possible.

...

So if you want someone to write about a subject he knows nothing about, a subject that others already seem to be exhaustively covering, a subject that requires him to read an increasing volume of sources and commentary (before one gets off the fence to accuse people of serious crimes, one would have to invest some effort to make sure one has one's facts right), a subject that he doesn't really find fascinating, at a time when he's pretty busy with other things -- why, then, you know what you're asking him to do. You're asking him to work. And you know what it is customary to give those who work.

To return to Eric Rasmusen's weblog, click http://php.indiana.edu/~erasmuse/w/0.rasmusen.htm.