On my last roadtrip in Canada I missed a good App for my Android phone to find/see nice places while driving around, and Everytrail guides look to fill that gap, but (there's always a but)
I would like to plan my trip in advance and fill it with POI I find around the web or I want to do, make this as a guide and use this on my next roadtrip as guideline, but off-course this would not be 'public' quality, it's more like a planning.
So I thought: private guide, because all the technology is there with Everytrail.
In the end this would be my killer app than: recording your trip with gps, take notes, pictures and in the meantime you know where the POI's are which interest you...
I was thinking of writing something like this my self, but was first looking to see what's available.