My wife and I just use Zotero (the free software reference manager). This works for our 1,200 or so books. We also have a small spreadsheet of titles we are hunting for at second hand book fairs.
The Zotero application has a great feature that pulls a book's details from worldwide library catalogues in most cases if there is an ISBN.
Also, dust covers on hardbacks, do you toss them or keep them?