I just put out version 0.6.4 of Bookcase. Two new translations were added: Japanese from Linux Magazine in Japan, and Dutch from Liese De Vos. Some minor sorting bugs were fixed. The filter dialog no longer crashes Bookcase on KDE 3.0. The surname matching problem, when periods are in the middle initial, is also fixed, though only for Qt 3.1 or higher, since it uses QRegExp::escape which is new in Qt 3.1.
I'm working on verion 0.7, which will have support for multiple collections, as well as for collections of thing other than books, such as DVDs, coins, stamps, etc. The hard part is figuring out what the best default fields are.