I love "Hero-Heroine" and "On Top of the World". Those two are from their 2005 album, if I'm not mistaken. :) They went here in the Philippines and held free concert in the local malls. I didn't get to watch them because I had an exam the next day. I saw The Click Five though.
My favorite song by them would either be "Dance Hall Drug" or "Five Minutes to Midnight"
My favorite song of Boys Like Girls is "Up Against The Wall" and "Kill Me in a Record Shop". They have both great lyrics and I love all the songs of Boys Like Girls.