Everything had been working fine for months but suddenly I got this error: "Unable to launch the asp.net development server because port xxxxx is in use" - where xxxxx was the random port used by Visual Studio.

I managed to fix this issue by changing settings in my Anti-Virus software (ESET NOD32). Under the Setup menu I selected Advanced Setup. I then navigated to the Web access protection area of the configuration and selected Web browsers.
Once in this area I then excluded both Visual Studio 9.0 executables.

When I returned to Visual Studio and hit F5 or selected View in Browser - everything worked as before.
Not sure why this started happening but I'm glad it's fixed!
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