The term "IT Professional" is a very broad classification. In the most liberal translation, I believe it means anyone whose primary job function is in the information technology field. This includes computer or network support personnel, software developers, IT managers, CIOs, technology consultants, telecom engineers, web page designers, and many others.
However, I don't think it includes everyone that works for a technology or dot-com company whose primary role is not in technology; HR personnel, graphic artists, or marketing professionals. These individuals could just as easily move to a non-technology enterprise and perform the same function.
Then there are those in the gray areas, such as myself. I have worked for the past 7 years in the IT Support and Database Management field, but I now work for the editorial dept. of technical publication. Does that mean I'm no longer an IT professional?
I don't think so. I still consider myself an IT professional, because that has always been the primary focus of daily activity. I'm a techie at heart and I'll always be one.