If you create or view a lot of sample projects or demos, you’d love this.
While there is no GUI for this, all the recently opened projects are stored in the registry under HKEY_CURRENT_USER\Software\Microsoft\VisualStudio\8.0\ProjectMRUList key. All you have to do is open regedit, navigate to the key above, and remove whatever items you don’t want to keep.
Be careful! You may have to rename the keys, so, at least File1 through File6 are there… If you delete File1 entry, keeping the rest, VS will show no entries in the recent projects ions list!!!