Jimmy Wales and friends have been appealing to users of Wikipedia for donations to the Wikimedia Foundation to fund Wikipedia and sister projects through 2011.
Wikimedia Foundation runs various sister projects along with Wikipedia.For eg. Wikibooks is a free textbook initiative and Wikiversity is an interactive learning platform. For this Wikimedia employs 58 salaried staff.
To cover costs for staff and maintenance of the world's fifth largest web property, Wikimedia is aiming for 16 million USD in donations for 2011. The fundraising started on 12th November 2010 and so far they have collected 13.4 million USD.
To donate, you can goto http://wikimediafoundation.org/wiki/Donate
Update(1 Jan 2011): The fundraising is over and the goal has been met. Jimmy Wales says thank you, but we say thank you Jimmy! More power to Wikipedia and people this new year!