I doubt if many of the writers of SharePoint 2010 books are getting much payback on the time and stress they have invested in writing the books.

Even if there seems to be a fairly large market for books on SharePoint 2010, there has to come a point when there are quite simply too many books chasing these potential readers and I'm fairly sure we reached that point quite a while ago.

My own list of SharePoint 2010 books now lists 179 titles.

Now some of those haven't been released yet (making it even less likely that they'll sell well); some of them are translations of English language books (meaning that those books are in effect listed twice [or more]; and some of the item numbers in my list probably don't have a book listed (but probably only a couple), but still. Even without all those cases we're still well over a hundred with more being added (that is making it into the shops) almost weekly.

Can there really be a need for (?) 150 books about SharePoint 2010 and how many of those are what could be called "parallel" editions - meaning the same things covered in a different series from a different publisher?