I was thinking.
I sat down on Saturday and made a spreadsheet full of the titles on my account that I had registered (something I'd been meaning to do for a while). I'd been meaning to do this for a while, as I don't know of any exhaustive/definitive list out there that has every single potentially-registerable game out there. Nintendo sent out that list of games that were dropping in value, so this was a good opportunity to check that kind of thing.
So I wrote out the entire list by hand and then went back and marked which titles I'd registered. I don't have digital titles in the spreadsheet yet, and I know I'm missing some titles here and there, but I imagine I've got 70-80% of all the possible titles listed.
Anyway, this made me wonder why this process wasn't easier. What I decided is that it would be really great if there was an iPhone (and/or Android) app that you could use to log into your account, it could generate a list based on the things you had registered, and then compared it to a master list. That way, you could know immediately which games you had registered and which ones you lacked. There might even be a way to have it allow you to register the games and then complete the surveys.
Iwata has said recently that they are working on a way to allow people to log into a website to set up purchases of digital content/titles through devices like phones, so I wonder if this will ultimately be tied into the CN account stuff.
I wonder how hard it would be to write an app to do the above though.