The final voting phase is now open until April 30th! There are four categories that are being decided by popular vote: Best Picture, Best Log, Best Event and Cacher's Choice. You can submit your vote multiple times. Only your final vote will count.
The details of the rules can be found at here.
Unfortunately, hyperlinks do not work in a google form, so please find the list of nominees up for popular with links at the top of the full list of 2011 nominees.