Kudos to Nuevasync to close out the year and match the kudos I gave the company at the start of 2009. This time, Nuevasync allows Windows Mobile calendar users to assign a Google calendar to a category in their WinMo calendar, making it easy to manage multiple Google calendars in the (Windows) palm of one's hand. Let's see the iPhone do that! (It can't: the iPhone native calendar doesn't have categories.) The new Nuevasync service is $25 a year -- a fair price.
Score one for Windows Mobile ... after a verry long drought!
Update: It's true, as a commenter to this post says, that the iPhone can merge multiple Google calendars into one iPhone calendar. But the new Nuevasync also lets mobile users assign events to a particular category which then feeds back into respective category, and the native iPhone calendar (still) can't do that.