Like to take a guess how many Webmaster Guidelines pages Google has? More than 50!

And guess what Google’s method for informing people when they get updated is? They don’t. Despite it being critical for online success to be aware of Google’s myriad of guidelines, they update them frequently and don’t tell anyone. The onus on you is to repeatedly check.

Hobo Web have made a nice page that keeps track of when the Top 50 Guidelines pages were last changed.