Is there anything else about a game in your collection that you'd like to track?

I think the website does pretty much everything. I know you mentioned early on something about building in something along the lines of strategy guides. Maybe add something that says if you have a Strategy Guide for the game or not?

Also, can you tell me what your thoughts are towards the use of the Backlog checkbox? I've not used it but didn't know what your intentions were with its use.

The Backlog flag is there so you can know which games you want to beat at some point. For instance, I sometimes buy games for pure nostalgic value and have no intent on actually playing through it, so I wouldn't put it in my backlog.