One suggestion I have had for a while and been wishing for a year now is I would like to see some-sort of liquid flow regulator, preferably for water. Basically, something that can either allow or shutoff waterflow - digitally from USB. If you guys do that, phidgets will open up to a whole class of new projects for commercial hydroponics & aquaponics.
Back in the day I build a aquaponics system (Here is my video: http://www.youtube.com/watch?v=BQNMcZXCbYA ) and I now I was planning of doing somesort of automated-aquaponics setup.
Again, just a suggestion. So please think it over. Honestly though, I would like a three-phase brushless motor controller very much so as well!