[Minty]

I don't think a guide would be all that useful, because like mentioned everyone's foot is different--i.e. some people will think that a shoe is too wide, or too long when they say they need a smaller size--but which one? It gets really specific. Personally, I like a smaller width more snug shoe. So if I say that the shoe fits right, it is usually more snug. To someone else though with the SAME foot as me this could be too tight. Everyone has their own opinion on what fits right.

There are some sites out there such as Zappos.com that have ratings for shoes and if they fit "true to size," if they are too wide, arch support, etc. To be safe though, you are better off doing business with someone that excepts returns. You can never be sure that a shoe will fit until you get it.