I remember reading about plans to ask the user their favourite anime series and then tally it up throughout the site to find out which is the most popular. I had a similar thought but aimed at the resolution the user uses. Whether this be 1280x1024 or dual 1600x1200 monitors, I think it would be kinda cool as then this could be tallied and wallers could look at the most popular resolution and create their walls accordingly.
The majority might not care, but it might be a nice touch to submit your wall, but have links to other popular resolutions aswell.
Just a thought and I don't think it's been mentioned before. I'm sure shinsemgumi will correct me if I'm mistaken ;) .
NOTE: This is NOT a request for your resolution, there are other threads for that purpose ;)