http://blog.wired.com/geekdad/2008/0...-no-longe.html
His reasons basically boil down to:
1. The installer is 80MB in size.
2. MobileMe -- installed by default, but most (Windows) users will never use it -- until they get an iPhone.
3. Bonjour -- secret program installed by default... for what?
4. Safari -- why is its installation accepted by default by the update program? (This one I agree with completely.)
5. Outlook Add-In -- so that you can sync your contacts with your iPhone (or iPod), but perhaps should be optional?