I am a recent adopter of Paul's wonderful program, 'My Library'. After initially using the program, I contacted Paul with some minor suggestions to make the program even more useful. He responded very quickly and actually adopted 2 of the suggestions I made. I was using Delicious Library to maintain my substantial library but found that it is a little cumbersome and in some cases difficult to use. After using Paul's My Library and entering all my library I find that it provides a very clean and minimalistic application experience that is simple to use and very responsive. I might add that Paul is very responsive when contacted, something that also is a big plus for his program.
I've looked for a program like this for a long time and had just about given up until I stumbled upon his program.
I have nothing but positive feedback for both this program and Paul, it's developer. If you want a Library program to track your books, authors, and whether you've read them or not, this is the App for you !!