And don't ignore the virgule, which has a different slope. Bringhurst states that the solidus should be kerned,which implies no spaces before or after. However, his printed examples have quite a bit of white space around them, indicating very loose kerning.

It depends on the context whether a line break can occur following a slash. FOr instance, it's never OK to split the two parts of a fraction, but if it's two words that are separated by the slant character (there: I've used all the terms for it) then a line can end with the solidus. Personally, I wouldn't end a page with it, though. Too confusing.

- Herb

In English, I go by the context: by default, I space / around the slash, but sometimes it helps solve ambiguity not to have spaces. So whichever is clearer in context. In the same way that a hyphen becomes an en dash when one of the compound parts it's connecting is more than one word, I think a slash gets spaces around it when one (or more) of the things it's diving is more than one word. I usually prefer spaces, though, unless there's a good reason not to. I think Bringhurst has examples of both styles, which seems to imply it depends on context.