How about several times a year...
The books of the Liaden Universe are my 100% top favorite books EVER. www.korval.com
Great space opera with a (sorry guys) romantic edge that really humanizes the stories. What started out as a single and a duology, is now something like 10-12 books heading both temporal directions from the stories of the first 3.
Literally the only books that bring me to tears every time I read them.