I'm regularly reviewing books on LibraryThing, GoodReads, Amazon, etc.
A while ago, I decided I could combine those reviews with a bit of publicity for Marvin and this month, I got around to actually do it, e. g.:
http://www.amazon.com/review/R3UQ6IU5YWI5JI
(Note the final sentence in that review. :) )
If we all did that, it might actually help spread the word a little... :-)