Hamming, the famous scientist, once suggested that researchers should focus on the most important problems in their field (in You and your research). I believe this suggestion may apply to anyone and not just researchers.
It sure sounds like good advice, but putting it in practice is difficult. First, we have to define what an important problem is. There are a few telling tales. For example, if there is a chasm between what the current theory says and what we observe experimentally, and most people are willing to recognize the gap, then you have an important problem lurking. More generally, an important problem can be recognized as a widely-felt unsatisfied need; the need to explain, by a theory, the experimental evidence, being one instance.
Back in 1996, finding good Web pages was hard. I think that most people would have agreed. Many people, me included, started Web pages for the very purpose of keeping track of good Web pages. Yahoo! made a business of maintaining a taxonomy of Web pages, and it was hard. Google came along and basically fixed the problem. It is moderately easy now to find good Web pages; at least, people around me no longer complain that they cannot find good Web pages nor do they pay people to do it for them.
What are the important problems in 2007? The ones we should all be working toward? Any ideas?
To be honest, I am not sure. The technology works pretty well as it stands. My laptop is good. I do a lot of hard work, but I am not sure I would want the software to take over tomorrow. All tools could use more of a finishing touch, to be sure… but a serious need? I am a pretty content person. I do not get frustrated much by technology these days.
This is not to say that I do not feel like my research is important. I think I do some pretty cool stuff, but I would not say that I work on a big problem. I do not know anyone around me working on a big problem as defined above. Some would say that the quest for AI is one such problem. Maybe. Proving that P=NP? The unification of the laws of Physics? Cheap electricity through something like nuclear fusion? World peace?
See also my posts The big scientific questions in computing have been answered and You and Your Research.