Visual Studio 2008 Tip : Multiple Startup Projects
I was demonstrating to one of my collegaues a POC I had written and I showed him one of the integration demos where I have a two-console application -- a producer and a consumer that communicate by WCF. He was surprised to see that I had two separate console windows running from within Visual Studio.
So just in case you don't know that as well, all you need to do is to go to the solution properties (Right click on the solution->Properties) and under "Startup project" select "Multiple Startup project".
You can even decide which projects will run with a debugger and which won't :)