I think we need a tag for small, hotshoe mountable flashes. You could then tag your question with
[flash] for questions that could also include other kinds of flash - I'm thinking things like Alien Bees etc. here - and additionally
[speedlight] (or whatever) for a question related specifically to small strobes (if you were short of tags you could drop the
[flash] tag???). As per normal you could add a
[whoever] tag if your question was brand specific.
I suggest either
[speedlite], the latter being the Canon spelling. Personally, I'd go with the
[speedlight], despite being a Canon user, but I'm open to any suggestions to cover hotshoe-mountable flashes.