Feel a bit embarrassed that I've never come across SourceWatch before. It's a good source for checking the worthiness of sources. Essential in the age of googling and especially as news desks expect you to have checked the veracity of your sources before the readers do it for you the next day . . .
And while I'm in the fessing up to all the holes in my researching capabilities, I came across an interesting feature on google. If you put a website in the search (complete with site suffix, eg .com etc) you get an option to either go to:
1) sites referring to the site you're searching (good to see if you're checking out the reliability of the site)
2) sites that the site refers to (good to see if you're checking out if the website has bonkers friends)
3) sites that are similar to the site you've searched (not sure how it does that)
4) and finally sites that contain the actual url.