I own a first generation MacBook Air and this has bothered me since the beginnings.
When I bought this thing, I was sure I'm not going to carry a DVD drive. I don't use it. WiFi has worked pretty well for me so far and in fact, lack of optical drive was the least problem I had with it (the worst was the heat and CPU frequency reduction).
But there's a useless eject key right in a place suited for a great delete key (the real delete, in PC terminology, of course). It'll help a lot when you're developing in Xcode. I feel it's handled at a lower level than standard keyboard shortcuts. Is there any way to remap it to delete?