Since I installed Boot Camp, I’ve been rather annoyed that my MacBook boots into Windows unless I hold down the Option key and choose the Mac OS X startup disk.
The other day I mentioned this while chatting with a friend who works at Apple. I believe his answer was something like, “Huh?”
Turns out this is easily fixed by going into the Startup Disk System Preference and choosing (or re-choosing) the Max OS X disk there. Sure enough, that solved the problem.
So just in case anyone else has been suffering through this and was too dense to figure it out - there you go. 
Note: I initially installed Boot Camp 1.0 beta, this may be a moot point with later versions.
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jared seaton adds this Comment:
There is a nice little program called rEFIt that makes creates a boot menu that will always show, you can find it at http://refit.sourceforge.net/
October 15th, 2006 at 5:57 pm
Drew Palmer adds this Comment:
This is the best single post in the history of mankind.
I spent a day online, in tech support queues, trying to talk to Apple and to Microsoft, all because I couldn’t get Mac OS to load up after I installed Boot Camp.
Then I found your response, and the skies cleared and I have my computer back.
Thanks!
October 26th, 2006 at 4:07 am
Duke adds this Comment:
Great post! Found my answer right away, on the first google link.
August 5th, 2008 at 7:09 pm