alternate spaces in urls

From my research, search engines view "-" as spaces.  I would not use "+" since it is a reserved character.  I would only use dashes, underscores, letters, and numbers. The general consensus from most SEO/SEM ers is to use dashes "-". http://www.domain.com/folder/keywords1-keyword2.htm But url structure, like in the example above, has very little bearing in search engine ranking.  URLs become a problem when you passing a bunch of parameters or the URL is too long. I'm working with a client and we're coming up with alternate ways of showing urls, directory and file names. Normally, a dash (-) in an url is understood to be a space. A plus (+) and a %20 are also valid url representations of a space. Any thoughts on their value in an url? I'm experimenting but if someone has seen something, I'd love to know. Also, I'd like to see what effect a double dash (--) has on an url. Does it mean something other than 2 spaces? -- Michael Dinowitz President: House of Fusion    (http://www.houseoffusion.com) Publisher: Fusion Authority    (http://www.fusionauthority.com) Adobe Community Expert / Advanced Certified ColdFusion Professional