I won't jump to a Mac because, as long as people keep saying you need to run Windows software on it...well, clearly, it's just easier to run windows.
And I like being able to sync my phone with Outlook -- and use Yahoo Calendar as both a public "publishing point" of my calendar (and backup of data) as well as an easy way to sync my calendar/notes/tasks/etc between work and home.
Two button mouse on the laptop. A total brainfade by Apple to not have it built in. Sounds small, but it's deeply annoying not to have it -- and I buy a laptop to make my life EASIER, not harder.
And finally, the cost of constantly upgrading the OS is annoying to me. And Apple makes you pay for upgrades all the time -- compared to MS, where you can pay once and then get upgrades for a LONG time.
And finally...it just costs more.
Steve