>>Be consistant with it, too. I have caught myself using a different namespace structure in different solutions. For now when I work on a new solution, I keep my old solution open so I can refer back to the previous structure that I used.
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>Do you open two instances of VS at the same time, to keep two solutions open?

I find that easier... I like having the two instances in the taskbar so I can pop back and forth. Make sure that your "old" project is checked into VSS though, because often I get distracted and I start typing into the wrong session. If your example project is checked into VSS, then you will get a prompt asking to check it out, and you can catch the mistake at that point instead of catching it a half hour later. I did this last week, and it really put a dent in my day.