My editor had suggested I release my book (romance) at Christmas when people gifted with new e-readers are looking to load them with new books. I was thinking Black Friday when everyone is online looking for deals (I plan on doing Amazon advertising). Has anyone found a particular time of year or day of week that they found works better than others? Thanks.
The days when we sold scores of books on Christmas Day and every day for the week or fortnight following are long gone, I'm afraid. My last great holiday month was January 2012. Most ebooks are now read on tablets, including but not limited to the Kindle Fire, and most people either have that ability or have no intention of going to digital.
(Don't trust KDP to publish a print edition. Don't trust CreateSpace to publish an ebook.)
Black Friday is actually one of the worst days to release a book. Everyone is running around looking for deals on gadgets and they have no interest in reading.
As Notjohn said, the best time to release a book is when it's ready. If you have a seasonal (Christmas- or Valentine-themed) book, that would be different. And forget about AMS between November and January unless you don't mind losing money: the system is already flooded now, and bids will rise to atmospheric levels over the holidays once all the newbies jump in.