I think this idea has a lot of mileage, and it's something I'd very much like as well (plus many others I'm sure).
With the MHL output, something like this should be possible.
I've got an MHL cable, bluetooth Keyboard and Mouse, and it's ok, but the software is not designed for such a setup, and the screen resolution is far too low.
Sadly I'm not a dev, but in order to create something that can achieve an Atrix 'webtop' like experience for the S2, devs would need to work out how to get something other than video to be output at a higher resolution than the native 800 x 480.
Does anyone have any ideas as to how to achieve this?
Could a separate Linux based system be run in parallel to Android, but output via the MHL output?
The S2 is powerful enough, it's whether devs have the tools available to achieve something like this, which could lead to some very cool peripherals (tablet docks, net-book docks, desktop docks etc).
I've noticed this idea mentioned in a few places - are there any devs willing to take this as a project and give it a go? I'd be happy to help organise, but sadly have no programming skills.
Current phone: Samsung Galaxy Note 2 LTE
Previous phones: HTC Kaiser, SE Xperia X1, HTC HD, HTC Pro2, HTC HD2, HTC Desire Z, Galaxy S2, HTC One X