You might be crazy, at least about this
All kidding aside, what you seek would be nice to find, but sounds a little far fetched and probably even over kill. I'm using an Oregon 450 GPSr and I'm thinking you could use this as your central repository for everything you want to collect, but it wouldn't be able to actually collect all of it. For example, you can store pictures on it, but it doesn't actually have a camera. You can store waypoints with it and upload topo maps and birds eye view maps (like google).
We always bring a digi cam and a flip video recorder in case we find something worth documenting in either still or video picture. Good luck with this one!