Gannet's delving into EMI also goes beyond this thread. He's sent me a fix so that windowed mode now works when EMI is patched into a higher resolution.
As a result I'm updating my EMI launcher and its resolution patch. It'll include the windowed fix, Gannet's 'double size' video patch and will let you choose a custom resolution, rather than the 4 pre-selected ones there are now.
The reason I'm posting this is because I also want there to be a decent list of common resolutions to choose from for non-expert users. There'll be the option to type in your own res, but I want to keep the dropdown list with the resolutions already in. Does anyone have a list of common resolutions that you think should be included? I don't want there to be so many that the choice is overwhelming, but there should be a reasonable selection for 4:3, 16:10 and 16:9 aspect ratios.