John Wiley & Sons added to its long list of co-publishing ventures last week, signing an agreement with Seybold Seminars and Publications to do a series of software design books. The first three books in the series, to be known as Seybold Seminars' Complete Course, will be released in October; three more titles are under development. Wiley will market the books to retail outlets, and Seybold will promote the line through its seminars and publications.