Personally, I think we should keep the guide. Sure, it's out of date; but, that just means we need to update it. Plus, I prefer having something that's downloadable, as I'm on a dialup connection and need to keep the line clear.
If we had an CVS or SVN we could keep a working copy of the guide there, and then just periodically compile a distributable.
I would also keep the homepage (that is unless you're reaching your bandwidth limit). News sites that cover GearHead link to it, and it's nice to have a homepage for stuff. Maybe you should change the homepage to more of a blog format, where you update it periodically with version changes and other news.
[edit] Nevermind. I thought the roguelikedevelopment page was the homepage. In this case, go ahead andd axe the homepage. My comments regarding the blog format still stand, though.
[edit2] On a side note, I added the GearHead quickstart guides to the wiki; so, most if not all information has now been transferred there.