Nikon d40.used for professional work?

I've had the camera since it came out and have been doing mostly landscapes and scenery, although i have done portraits and one wedding with it as well… I don't use the kit lens i have a 18-200 VR on it. As well as a flash unit

i want to get into more professional stuff which is what i'm in the process of doing now… I wanted opinions on use of this camera in the professional field?

there's other thinks i wanna get like more flashes and a superzoom lens for wildlife… But would like opinions on the camera for use in the professional field to see if i should wait on those and get a new camera…

PS: the camera has been well taken care of and its insured as well as all my photo equipment.

Your skill, your lenses, and your lighting are FAR more important than any body for pro level work. I will say that the only problem you could eventually have is that the D40 was built to a price, … A low price. It is not truly built to withstand years of hard use in all environments. It was purely built as an entry level camera for those first DSLR owners. Again, with the right lenses, light, and skill, it can take wonderful, pro quality photos. The question is how long it will continue to do it.

The only thing that really makes a "pro" camera is the build strength and long term life designed into it. I would say replacing the body is not necessarily something you have to do now, but down the road you should be expecting it. Plus, lets be honest, the sensors and processing of current bodies really have made some great strides since the time of the D40.

The D40 is sufficient for professional quality work.

However, you can't expect to get professional quality without a tripod… Period.

http://www.istockphoto.com/search/portfolio/1156206/?facets=%7B%2225%22%3A%226%22%7D#6ee4851

This is my portfolio… Images are sold online. They are taken using a 6mp Nikon D50 (lower end than the D40) with kit lens and a $10 tripod (long since rusted) which has been replaced by a rock solid carbon/steel and ball head tripod.($30)-- Targus at Wal-mart and replaced the head with a sunpak trigger ball mount ($19). Everyone always ignores the tripod, but the 5 pixel hand held camera shake you avoid with a $10 tripod trumps the 1 pixel resolution variance between a $100 kit lens and a $500+ pro lens.