What's the best way to exclude a page from my Google Analytics?

1. You could use an if statement in the header to check what page it’s being loaded through, and not present analytics in the header

2. You could have that page load a different header

Easiest way is to remove the tracking info from the page footer.

<meta name=“robots” content=“noindex,nofollow,noimageindex”>

<meta name=“robots” content=“noarchive”>

Put these in your head tags.

This will help you remove a URL all together:
URL removal tool
http://www.google.com/support/webmasters/bin/answer.py?answer=164734

You can also create a funnel within your analytics to exclude the page itself.
You should be running to analytics services parallel to each other, as no service is 100% accurate.

Just a thought!