I am probably going to get either the SB600 or SB900 (most likely the 600 due to cost and being more portable), and was wondering if someone with the SB600 could post a portrait type shot, indoors with and without the SB600 flash?
As others have mentioned, an example shot is not going to be of much use. Getting a flash like an SB600 or SB900 is the easy part -- learning how to use it is a lot harder.
If you just put an SB600 on your camera and take a portrait-type picture, the result is going to be very similar to what you get when you use the on-board flash. Not much different from a P&S with flash, in fact.
However, when you start bouncing your flash, things start looking different. But the result will depend on what you bounce the flash off (wall, ceiling, reflector), at what angle, what distance and direction from the subject, etc.
Then you can balance the flash with other light sources, use it as fill-flash rather than the main source.
Then you can take the flash off-camera, light the subject from the side. Use a narrow or wide beam. Light your subject from behind.
And then there is the use of multiple flashes, when the possibilities are really only limited by your imagination.
If you just want to make a good, studio-type portrait shot, there are some standard setups you may be able to use; that may or may not be enough for you. But the real fun with flash comes from being more creative.
By that time, you may want to check out
http://strobist.blogspot.com .
Eric
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http://www.lumenssolutions.com/