Quaintly described in the press release as "now available on flat pieces of dead trees", Tamoggemon Software, based in Germany, has written a book which "takes C++ programmers and transforms them into lean and mean Symbian coding machines". The book covers all Symbian versions from S60 3rd Edition onwards and covers Ovi Store and Symbian Signed - the only catch is that the book's only available in German so far - the writers are looking for an English language publisher. Photo and a link below.

"Effective immediately, the 200 page book can be purchased at Amazon
Germany or in bookstores all over Germany, Austria and Switzerland for a
price of about 30€."