I think it's interesting. Would like to see it implemented somewhere, and it might be a solution for those who don't like the idea of having expression pedals embedded in a pedalboard (like Davide I mean 
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The implementation seems sturdy enough... More details here (in Italian)
Here is another one, and I think there are a couple of others out there also.
The one below is 6" X 3.5", $149.00 (list).
[Blocked Image: http://www.boomerangmusic.com/Photos/WR/front.jpg]
Thanks, the one you linked is a real (expression) pedal, while those I came across are fx pedals.
I guess we'll never see such a concept implemented in the KPA pedalboard... But it looks like a very good idea to me 
Interesting idea!
Gibson made effects pedals in the 1970s with foot controlled potentiometers.
[Blocked Image: http://www.kitarakuu.fi/filelibrary/EFEKTIT/MaestroPhaserMB.jpg]
(Has DON seen this pedal?????)
Here is another one, and I think there are a couple of others out there also.
The one below is 6" X 3.5", $149.00 (list).
[Blocked Image: http://www.boomerangmusic.com/Photos/WR/front.jpg]
[Blocked Image: http://3.bp.blogspot.com/-Bl6y6c0Crkc/TnrAFlEdcMI/AAAAAAAAGIU/b0tbu_8gqBU/s1600/11-09-08SIMP1.jpg]
