ViewSonic VSD241 hands-on: you want an all-in-one with Android, you got it
It is one of many here at MWC, and it features a 24” IPS panel with multi-touch support, a quad-core Nvidia chip and MHL connectivity. That makes it a relatively affordable all-in-one, albeit with limited performance capabilities.
You can easily hook up a mouse and keyboard, and try and use Android on a daily basis instead of the more traditional Windows, OS X or even Linux. It’d be a limited choice, but it’s definitely an interesting option that many users without high demands will like.