In reply to Marek:
I might take a look. It's about time the promote control had some proper competition. For me a key requirement is battery life measured in days so a lot of the fancier options don't cut it, and the promote is a bit too expensive for me.
Tried a couple of options and ended up sticking with a 5 quid plasticky chinese thing. Something a bit smarter than that would be nice. Might see if the open circuit people have libs for the D7K and take a look. PIC might be a better bet than an arduino though.
This thread reminds me that I have several minutes worth of timelapse footage sitting on my hard drive from last year that I need to get around to deflickering and editing... Maybe I should see about pulling my finger out.