On the weekend I paved my machine to do an install of VS.NET 2003 for a course that I am teaching. Unfortunately earlier that week my wifes machine had a catastrophic hardware failure and is out of action. Of course, due to my superior planning technique I forgot to write down the MSDN Product Key for my Windows XP install.
So when it came to type it in I thought, no problem, and just whipped out my Pocket PC which has wireless and surfed on over to the MSDN sites. I found the Subscriber Downloads link and had a heart attack when it redirected me to a minimalist news page for MSDN articles.
At this point I had to call my little brother in law and give him my Passport account details so he could log in over his satellite connection and read out the key to me.
Sure, you could say its my fault for not writing down the number first, but I would like to blame someone else (afterall, it is always someone elses fault).
What would be cool is if when I hit the subscriber downloads site, it hits me up for my passport credentials and gives me two options - one to go and list out my product keys, and another to get some kind of subscription index (also something I've wanted occasionally). It is helpful for just these situations when you are doing an OS install and need a key but you have limited access to a terminal.
Another neat feature for the Longhorn timeframe would be a "tip" when the installer starts to suggest that you cancel out and go and get the key (just in case you forgot). That would help complete dodo's like me.
</rant>