That would be nice. Here's what I do currently. Let's say I'm looking in the 'S' section. The address reads:
http://www.auralmoon.com/html/pnplaylist.php?letter=S
If you tack on extra letters to the 'S' at the end, you can jump there. For example you can get to 'SU' by using:
http://www.auralmoon.com/html/pnplaylist.php?letter=SU