>I didn't do it because I'm a paranoiac. What are the benefits? Does M$ spam you or send you junk mail?

I rarely get spam from MS, but they send me plenty of junk mail -- occasionally something's interesting, though...

The benefits of registering products is (at least it seems this way) better service, now that I've built up a long record of purchasing/registering their products...for example, if a new patch CD comes out, if you've registered, it's simple to order it. If not, it can be a hassle...