Just to be sure, i had to include a comma in one of my modrewrites because _ and - were already being used for different matters... is this ok? I have never used commas before and want to be sure they are seo friendly
I've seen this method used by Mambo systems and I don't belive there is any problem with it. I'm not sure how search engines interpret the , though, but it doesn't seem to be harmful at all.