Cures for blogger's blocks

There are two kinds of Sphinxes:

1. The ones who don't blog even after you pester them more number of times than you care to remember
2. The ones who return to the blogosphere after you leave them well alone for a month or more
   

I guess the cure for the first kind could be to add them to your blog list, so that people can visit them and shame them about how well they write but it's such a pity they don't anymore. What say? :P