You can go back to slashing if you want to.
Just as long you don't go all "Jack the Ripper" on everyone... :-)
It looks like our uber-sysop, kotra was able to get the URLs with forward slashes (/) working again. At some point over the next couple of days we'll probably be moving all the pages with _-_ to the / format. (Don't worry, we'll automatically redirect all the moved pages.)