I know that there are many stores that accept BitCoins nowadays, but do any useful stores accept altcoins, if so - which? I can't seem to find a comprehensive list.

Here's how I see it from the research I've done so far: there are some small insignificant companies that accept a couple of most-popular altcoins that are no better than BitCoins.

Note that I don't want to insult anybody, by insignificant I mean subjectively, here's what's insignificant to me: limited to the US and/or very narrow choice of goods, like some guys selling special homebrew keychains or some type of special clothing, etc.. 999/1000 times I'm either not interested in it or can't afford some special little gadget, and I'm only interested in companies that ship to Europe.

Well, hope I did not insult anyone and explained my question properly.