If I don't use the Ctrl-Q method, the VLC.exe process stays open.
I have this same problem with version 1.1.0. If I close using any other method (besides Ctrl-Q or Alt-F4), VLC stays in memory. If I open again without flusing vlc.exe from the process list in Task Manager, I get another copy of VLC.EXE in memory. This is a bug that did not exist in the previous versions of VLC (the last version I had installed was 1.0.5).
Just to be clear, if I close VLC by double-clicking on the close button (the upper left corner of the window, i.e., double-clicking on the VLC icon on the upper left corner of the window), then VLC appears to close normally, but inspection of the processes in the task manager reveals that VLC is still running. The same thing happens if I close by clicking on the "X" in the upper right corner of the windows.
If I then double-click a video file in Windows Explorer, or if I try to run VLC by opening it in the Programs list on the Start button, nothing happens, and I end up with a duplicate VLC running in memory. Only if I then force these processes to be closed (via "End Task" in the Task Manager) can I run VLC.
While a minor bug, this does diminish the usability of the program.