I've got the outline up for the Victorian Age: Mage Rulebook, as envisioned by me1. It could still use some tweaking and filling out, but for the most part I'm happy with it. Give it a read, if you don't mind. If you want to contribute, by all means go for it. Don't be afraid. The great thing about a Wiki is that everyone collaborates to make something better.
It also gives me the chance to plug the RPGbooks Wiki again. ;)
1 And by "me" I mean eyebeams: original post