Tumblr in particular apparently has a clear stance in this argument, but what is the public consensus on spaces after a sentence?

My current manager uses one.  My old manager uses two.  George Bush uses one.  I use two. 

I’ve been a double-spacer my entire life, but I learned how to type on a manual typewriter.  I’m also fond of the sentence legibility that using two spaces provides.

How many spaces do you use after your sentences?