Consulting will keep you on the cutting edge. Also, if you're lucky, the company or companies for which you consult will want to buy a copy of your book for the entire staff. Trade Shows Trade Shows are a fantastic place to promote your book. Every attendee and speaker is a possible book-buyer. Try to arrange with your publisher to do a book signing either at their booth or the trade show bookstore.
Many authors sell thousands of their books at single trade shows.
If you can finagle a speaking gig at a trade show or are invited to speak on one of the panels all the better. Aside from being great book publicity, it's another way to get your name out there in the community. Research the major trade journals on your subject matter both in print and online and pitch article ideas tangental to your book topic. Also, you should consider writing for the major web sites that serve your topic area. Many publishers have done marketing studies that show that authors who provide comments on their books or participate in author interviews on the online bookstores sell more books online.