I've started to notice a growing trend with some answers which I'd like to expose and try to stem early on:
It's very easy to answer a question with a link to an online product retailer, or with a suggestion to simply replace a malfunctioning component. Often, this really is the only solution to many bicycle-related problems, so therefore not an incorrect answer.
However, answering a question in such a manner does little to increase the knowledge of the asker. We should try to explain why something does/doesn't/will/won't work, instead of just stating that something else would work.
Additionally, although I think we can all agree Sheldon Brown's website is a fantastic resource for all cyclists, his articles (and other similar sources) are generally very broad and all-encompassing. We should try to specifically answer the question at hand, directly customized for the asker, perhaps citing sources like SB as needed, instead of pointing them off to another website like a mindless search-engine hivemind robot. =]