I've always remembered it as the line you would trace out if you were swinging a sword with your right hand. Forward slash would be the line when bringing your right arm back as if your going to slap someone or serve in tennis and then bringing it down across the front of your body. Back slash as if you were going to back hand someone by bringing your right hand high up on your left and swinging down. Sounds complicated now that I type it out but works for me.

We use Confluence by Atlassian. http://www.atlassian.com/software/confluence/[^] It seems pretty decent. It's the only one that I have worked on so I'm not sure how it compares to the competition.