For the year 2012, I would like for you to take away the bad problems. In addition, find some kind of chess software that finds the top four best solutions. I do not know if Stockfish with 20 seconds is one of those that has the four best lines.
For the year 2013, I would like for you to add chess tactical motifs (34 of them) like chesstempo.com does to the good problems especially the tactical ones with the "t" in them.
Right now this website is 2nd only to chesstempo in terms of overall performance. I give it a B grade in a few months. A+ would be perfect.
Happy new year for 2012,