I'm struggling with the same question - but I have to add that I've been leaning toward book, because in spite of all the comments about the ease of having stuff as a website, I have no idea how to set up a website. A friend of mine just spent weeks trying to set up a website and finally has one page where the links don't work very well and it isn't centered. So I'm not excited about trying to put one together. The other concern I suppose is that paper is archival - 200 years from now someone can look at a book. Will a website still exist? Will the technology have changed and old websites be superceded by new formats? What about publishing as a PDF file, and sending interested parties a printable copy? Or burning a CD with a PDF and giving that to people? Or a Word or Excel file, set up so that cards could be printed out? Martha