Here via metafandom. Aside from the major death/rape/etc labels that most people agree on, the label I find most useful is wordcount. I really, really, like to know whether a story is 1000 words or 5000 words or 20,000 words because I might have the time or the will or the attention span *g* to read a shorter story but not a longer one, at any particular moment. I'm definitely more likely to take a pass on reading stories that don't have wordcount labeled.