The Linux industry-community has a tendency to get focused on computers for computers' sake, and often loses site of the fact that for a lot of us the computer is a tool to make the rest of our life easier. I remember when I first installed Linux 4 years ago installing a Quicken- like application turned into a nightmare of packages, libraries, and dependencies. I spent hours so I could save a few minutes a week .After 4 years, software installation is finally beginning to make some sense. My latest pet peeve is the difficulty of importing certain addressbooks to certain applications (Evolution, T-bird, KMail, OO, etc.). There are a few exceptions, but about the best you can hope for is to search deep in your file system to look for the table to export. At worst, and commonly, it won't work at all. This isn't complicated functionality, and it seems ridiculous that we're still dealing with it.
One of the many great features of BeOS (RIP) was a "People" file, a common file that would be used by all of your applications with addressbooks. I'm not sure if the same thing could be applied in a Linux distribution, but compared to our current state, there's gotta be a better way. The enthusiasm of the Ubuntu community is encouraging and infectious, I think it would be great if some of it could be channeled to solving some of the basic weaknesses of current LInux.