I've got one spot at each level open in May, as well as spots throughout the summer (although some top spots are taken), but as in prior years, I will be doing less blogging in the summer, and more to the point, I'm going to cut back in May this year, because I'm a bit overwhelmed with professional and personal obligations:  to students, to journals, to colleagues, and to family. Since I will be posting somewhat less often, top spots will be only $500, 2nd from the top $400, and 3rd from the top $300, and these will be the rates through the end of August.   E-mail me for more details.  Thanks.

ADDENDUM:  And you can see blog traffic statistics here.