Today my GMail account was upgraded to the new interface. The contacts management interface has been improved, but that's not what I'm excited about.
On a whim, I decided to review the keyboard shortcuts found at http://mail.google.com/support/bin/answer.py?answer=6594. Guess what? Google has added "#" as a keyboard shortcut for "delete". YAY! They've also added a bunch of other keyboard shortcuts I haven't seen before: mark as (un)read, archive and previous/next, and undo.
As a die-hard keyboarder, the lack of a "delete" shortcut has been most annoying. I've been waiting for this ever since GMail launched.