Yay! Progress! I have pretty much all of the functionality working. It took me a bit longer than originally planned because I had to learn the ins and outs of the wiki software (and because I spent the weekend at a friend's house instead of working on it) but now all that's left is to tidy it up so that it's usable for people who aren't the developer and then hand it over to be put on the live server. But first: sleep! I feel confidant that I'll have it finished tomorrow.

It works a bit differently now than when I made the first post. The big thing is that it's integrated into gogwiki - every user gets a special page where you can see their games (list or shelf view) and their wishlist. The other thing is that it can now update your game list and wishlist in the background from anywhere in one step - there is no longer any need to manually navigate to your shelf or wishlist page.

Sorry for keeping you waiting. Hopefully it will be worth it.