Tom, I have both Thayer products...the Birder's Diary for recordkeeping and the Birds of NA set for reference. I love them both, even though I found the former somewhat buggy. I understand, however, that the newly released version has fixed many of the problems. Also, I am amazed at how many times we have run into the latter product at refuge visitor centers and the like. During our latest trip a quick check on the calls and songs of some target species was instrumental in helping us find them. Fran -------------------------------- Fran Saunders Web Site Director Maryland Ornithological Society Baltimore, Maryland webmaster@mdbirds.org http://www.MDBirds.org