The software used by the pirate party is representative in so far as you can delegate your vote - on specific matters - to someone you judge to be more knowledgable than you, on that topic. He will represent you.
Two obvious differences from the rythmic-vote kind of democracy are a) you can remove you vote from your representative at any time and b) you entitle them to represent you on specific matters only.
Mind you, I've not yet used the software, but that's how someone deeply involved with the pirate party has explained it to me.
Since it seems that you can keep your vote to yourself, and in that case it indeed functions as a direct democracy... I guess that's what is "liquid" about it: http://liquidfeedback.org/mission/
All I want ist to be able to enter whatever information/command in the fastest way possible, and obviously to get them fast (large high res display)
Hardware keyboard is still the fastest for many things in my experience. That holds for smartphones as well as for tablets and desktop ui: my N900 is faster than an Optimus Speed for the keyboard alone, the ipad starts to get really useful with an add-on keyboard and a keyboard-oriented tiling window manager makes for fast work on the desktop, as Keyboard-Mouse switch takes allmost half a second and requires to at least glance at the input devices, that's horribly slow. That's obviously less true if the majority of my work is drawing something, but watch the freemind success: largely supported by the great keyboard support for creating mindmaps.
Same thing for audio apps: I need external controllers, an interesting trade-off, physical midi-controllers are much faster to operate than touch screen ones, but the touch-screen ones may be just that much better aligned to the task that they become faster when looking at the whole process.
The universe does not have laws -- it has habits, and habits can be broken.