although this isn't very accurate it will allow you to leave out any 300+ kbps mp3's. songs with usual length will be have size about 4-6 megs. so simply dont start downloading 8-15 meg files unless you know you are looking for a very long song.

hope this helps you on ...

p.s. hope we will have a display for this in the future, but at least vbr will be a problem here.