Single Page Website (using exisiting install) question

Hey there guys-
I would like to create a single page website for my ebook. Right now, it's on my blog but I took it off my front page (i'm using network theme) because I do not want to feature it there. It's an important part of my business though, and until I get some momentum on tutuology.com, it's my only source of moola.

Is there an easy way to add my book domain : wishsourcebook.com to my wpmu install? I don't want my tutuology site to take over the domain name (i.e. wishsourcebook.tutuology.com) I am sure this probably elementary, but I am gettin' there

Would love to know how to do this. Thanks a bunch!