In Los Angeles:
The Getty Museum exhibition Dialogue Among Giants showcases the mid-to-late 19th century photography of Carleton Watkins. Through March 1, 2009.
Read more about it at our friend Miserere's Enticing the Light.
The exhibition catalogue
is (I presume) available at the Getty now, and due at Amazon in March. If you don't have a volume of Watkins in your collection, you really should have at least one. The book won't quite do justice to Watkins' magnificent prints, but book reproductions will be an order of magnitude better than online JPEGs. Another one to look for is the out-of-print but very fine publication from the Fraenkel Gallery, which might still be available from the Gallery (check under "Publications" near the end of the list).
In San Francisco:
(Thanks to Miserere and Juan)
Featured Comment by Dave Karp: "The show is really a treat. I don't think that the book is really a catalog of the exhibit. It focuses on his work in Yosemite, while the the exhibit is farther ranging. It includes photographs of San Francisco and other locations outside of Yosemite. I particularly liked the still life of Watkins' own gold panning tools—a departure from what you usually see and think about when you think of his work. Seeing the mammoth plate camera on display along with the prints makes my 4x5 feel like a pocket camera!"