Using MBA 11 with VGA adaptor

I have just replaced my ageing, white iBook G4 with a MBA 11. Most of my time is spent hauling this faithful old trooper all over town and giving presentations by plugging it into all sorts of VGA projectors and/or big LCD/Plasma screens, so I decided to give my collar bone a break.
I just did my first presentation using the MBA (plus VGA adaptor), and had concerns about the on-screen image. I might be imagining it, but the image on the screen seemed less punchy and bright than that of my old iBook? Can this be possible? Also, the number of display resolution options in Display preferences has increased - including new ones that include the word "stretched" after them.
How do I know in each case, which is the best resolution for my MBA and each projector or monitor that I hook into?
Can anyone give me a steer, please?
PS: I hear a lot of whining about the lack of a backlit keyboard being a deal-breaker from would-be owners. I've just turned the room lights off and can see every key perfectly in the reflected light from the MBA screen.

The description of the iPad 2 says it mirrors with the Digital AV cable and the VGA cable since release:
Video mirroring.
See it here. See it there.
Video mirroring for iPad is great for every app, web page, presentation, video, movie, or photo you want to show a big audience. Just plug in the Apple Digital AV Adapter or Apple VGA Adapter (sold separately) and your HDTV or projector becomes a bigger version of your iPad. One plug, that’s it. Or you can wirelessly stream what’s on your iPad with AirPlay Mirroring and Apple TV. Everyone sees what’s on yourdisplay — even when you rotate iPad from portrait to landscape or zoom in and out.
Learn more about video mirroring

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