@blacklagoon: That's a fairly specific use case, so while I can certainly keep it it mind, I don't think it's likely to reach the top of my list in the near term. Happily, in a post a few down from yours, @zero_ described an app that sounds like it might do the trick. Although I haven't used either one, Screen Lock and No Touch both look promising.
@superkcross: With Apple's media framework you pretty much get background playback for free and, unfortunately, it's not quite as straightforward on Android. I'm not sure if you'll see it rolled in as an official feature, but one way to achieve the same goal would be to long-press on the play button to pass the video off to another player. I know that some media players like MX Player have an option to continue video playback in the background, so if you're willing to add another app into the mix, you could start getting that functionality right now.
@gs_dan: Chromecast has the potential to be very interesting, but it's still a bit early to really dive in. The SDK is still in flux, which stymies development a bit, but an even bigger issues is that Google is currently requiring that developers register each Chromecast device they want their app to work with which effectively blocks distribution. When the SDK comes out of developer preview I do want to take a look, but there isn't too much I can do until then. In the mean time, you might consider looking into XBMC. It runs on quite a few different types of hardware and, if you look earlier in this thread, @louiedog mentions that he uses an Android app called Yatse to send content--including videos from GBVB--to it. I'm not sure if it would be as seamless as Chromecast is looking to be, but I think it might fit the bill.
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