P.Z. Myers, at the wonderful blog Pharyngula, is hosting Circus #18. It is due online March 5th, so get your nominations to him by the 2nd. He can be reached here.
P.s. We're looking for hosts for #20 to be posted at the end of April, and for hosts for June and beyond. If you're interested in hosting the Circus of the Spineless at your blog, please give me a shout here.