What about...
My suggestion would be to adopt AppleRumors for a broad front end, but also keep MacRumors as a link between the Front Page and Mac Blog links in the navigation bar. Then use that page as a front end for all things Mac, and filter out anything that isn't directly Mac related. That then becomes the site home page for MacRumors while AppleRumors has it's own home page for the site as a whole. Good way to do what it says on the tin without alienating people who aren't interested in constant iPhone stories, yet still broadening out as a whole? Best of both worlds? What do does anyone think?
Why? Cause I've been here ten minutes and haven't found a Mac rumor yet! Mostly cause I was registering to make this comment... I suspect there might be one if I start to search...
Phil