Friends, I'd like to suggest something similar to the 'answer the unanswered' session: a 'write a nice description for a blank tag' marathon (I could not think of a fancy name as cool as the other).
Taken from the Tags page:
A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.
They are really useful when searching for specific topics or even to better classify our own questions.
Unfortunately, a bunch of those tags have no description at all. When you add a tag to a question, a short description pops up to help us decide whether this tag is relevant to our question or not. With no description, such harmless tag can mislead us to use it instead of a better one, thus requiring a possible peer retagging process.
IMHO even the self-explanatory tags deserve a description. I use to fail at tagging my own questions (Thankfully Caramdir, lockstep and Seamus always save me).
This idea is probably low priority, since things work pretty well in here. But I think we could benefit from filling up our empty/blank tags.