linkitivity presenter - show desktop in the meeting

LinktivityPresenter
LinktivityPresenter is a personal graphic communications tool for everyone. You can draw, highlight and type directly on your computer screen, on PowerPoint slides, on Word documents, Excel sheets or on any application that you have open on your computer. LinktivityPresenter is great for sales, professional services, consultants, trainers, software documentation, usability studies, quality assurance, incident reporting, medical professionals, online shoppers and more.

not free but not expensive -9.9usd

http://linktivity.com/presenter.html