So, I was googling around for UA Star Alliance Upgrades and came across the following site:

https://www.ua2go.com/starmua/starmu...Calculator.jsp

It takes you to the page on united.bomb to book a star upgrade.

Is this just an error, or are they back? I can't find any info on the actual UA web page?

I also found an article from InsideFlyer.com with Michael Schutzbank, Director Loyalty for Star Alliance Services GmbH who indicates they will be returning soon. It can be found here (scroll down) http://www.insideflyer.com/articles/...e.php?key=4753

Here's a quote:
"United launched Star Alliance upgrade awards for Mileage Plus members back in 2006 but after a year of dedicated work on both the UA and Star Alliance sides, we just could not get the product to an acceptable level of delivery. So about a year ago we agreed to switch off the product for Mileage Plus members. We have made some major enhancements and we believe we have fixed the problems we had with UA, and we are currently testing the system. If it works satisfactorily, I expect UA Mileage Plus members to be able to upgrade in the next six to eight weeks. I am also happy to report that all issues have been resolved between Air New Zealand and Singapore Airlines so members of KrisFlyer can upgrade on Air New Zealand flights and AirPoints members can upgrade on Singapore Airlines flights. "

I hope they return soon!