Well, I know for a fact that my email on a traditional web site is going to be indexed and cached by search engines, internet archive, etc, while on the Google Doc, I'm a little fuzzier on how permenant and searchable my email address becomes.<p>In a nutshell, I wanted to avoid spam; from bots, not from users here.<p>If I had had this account the other day, I probably would have just added that.