I had a look at Light Blue Software, a software business package specially developed for photographers. Maybe my business isn't big enough yet, but it seemed a tad overcomplicated for my needs - like having a consultation, a general anaesthetic and a surgical procedure when all you are doing is trimming your nails. To be kept under review, however, as all the feedback I have seen it get elsewhere has been exemplary.
[While we're on the subject of software, you'd think Portrait Professional would have arrived at a position whereby it didn't crash Photoshop constantly but, sadly, it hasn't. Ah well, still a time-saving piece of software, just not one you can rely on 100%].