My publisher, Packt Publishing, is running a campaign at the moment in which you get 20% of each Silverlight book, 30% even if you order the e-Book version!
So, if you were looking to learn some Silverlight, or enhance your skills, this might be the perfect time. The campaign runs ‘till the end of September, and you can find all the details here.
(and of course, my Silverlight book is included in the deal as well ;-))