Scrolling down to "T" on the NYT's 2007 list of popular Buzzwords reveals that they decided to included "Truther" in it:
http://www.nytimes.com/2007/12/23/weekinreview/23buzzwords.html?_r=1&oref=slogin

I don't know if this can be seen as a compliment though considering some of the other words listed like:

"vegansexual n.

A person who eats no meat, uses no animal-derived goods and prefers not to have sex with non-vegans."

The list seems to have been complied by a guy called Grant Barrett who is apparently a "co-host of the public radio show “A Way With Words” and a lexicographer."