Well, to be quite honest, i haven't been working on this at all lately, but i might just pick it up this evening. One problem is the coverart for SNES and N64 roms, which have a so-called landscape layout. Dunno about others which might have it, but it's a problem if i can't make a rule for each emulator/console. I think Cheekar has to add a sting in his code so we'll be able to select either "DVD" or "Landscape" coverart for each group, maybe a third group for "CD" (1:1) art.
But i'll look into it this evening, and priority the DVD-scaled coverart for now. I did accomplish a rather good layout last time, but i'll have to start over (Lost my data after installing Win7b).
One work around could be to use the cartridge art for N64. It is shaped similarly to a dvd box. If that doesn't end up looking nice, you could also try using each games title screen shot, which are all in 4:3. Don't know if thats any better.
Anyways, this look great, hope it becomes a reality some day.