Like Jez I also weigh everything and only very rarely do I use volume measurements.
A lot of people like to use MFP, but I don't. I just use an old fashion pen and paper binder. I use this website to look up the nutritional value of all foods that don't have packaging, especially produce:
http://nutritiondata.self.com/
I really like it because I can change the measurement from ounces to grams to cups to size of fruit, etc. I don't know if that's any help or not, but there you have it.
Good luck getting things figured out!