One of the reasons I enjoy open source is that a lot of the more mature packages start focusing on nice little touches that it would take a while for a big company to get their minds around. But since the source is out there, it just takes a little quirk to annoy some developer in the world, and you’ll soon have a new feature.
A good example is Kontact, KDE’s groupware solution. If you go to send an email message, and you wrote a word like “attached” or “attachment” in the message, but didn’t attach anything, it warns you with a dialog box. It’s a little thing, but I can’t tell you how many “Oops, here’s the attachment” emails it’s prevented me from sending. Deane nearly fell off his chair when he saw that one.