I'm a big fan of the Art of Manliness - a website dedicated to 'reviving the lost of manliness'. It is also an awesome online community.
One of their recent articles claims that excessive sitting is bad for your health. As a programmer, that does not bode well for me.
Become a Stand-Up Guy: The History, Benefits, and Use of Standing Desks
On a side note, it might be an excellent business opportunity for the carpenters among us.