For those who want to know their exact UA mileage for certain routes, you can use this mileage calculator that I posted:

http://www.faremetrics.com

In the "options" section, select "United Airlines" from the list and it will pull mileage data from UA rather than try to calculate it geographically (which often can be wrong).

Let me know if you have any problems - it's still being tested, but it appears to be working perfectly. Suggestions, comments always welcome.

[requisite disclaimer: data may not be accurate. use at your own risk.]