Nope, the "System Builder"/OEM license appears to cover that as well now[0].

[0] (footnote) http://blogs.windows.com/windows/b/bloggingwindows/archive/2...

Pretty sure the pure "retail" version of the OS disappeared with XP->Vista. Everything on a store shelf today is an upgrade copy, and the version sold from people like Newegg (which is what I meant) is titled something like "OEM version for system builders".