Koush's Mirror app[1] works alright with his Allcast Receiver Chrome app. The interesting thing is that using it actually revealed a (broken) second screen mode in one of the apps I use, didn't know Android had APIs for that. Perhaps it's intended for Chromecast/Miracast and whatever Mirror does looks like that.

[1] https://play.google.com/store/apps/details?id=com.koushikdut...