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 `[canon]`/`[nikon]`/`[whoever]` tag if your question was brand specific.

I suggest either `[speedlight]` or `[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.