buckworks - 3:12 pm on Feb 3, 2010 (gmt 0)
This gives you a clear proof of the conception date of your work.
That is an all-too-common bit of outdated, misdirected thought. The minute you open the envelope to "prove" your case you've destroyed the "evidence".
I see the [four letter word] website turning up in a range of searches, and in topic areas where I have some expertise I recognize a lot of misinformation.
Regarding the article referenced above ... it purports to be about "How to Handle Theft of Website Content" but it doesn't know the topic well enough to mention something as basic as DMCA. Or even Archive.org for that matter.
I'm resisting the urge to speculate on the motives for [four letter word]'s own site giving outdated and incomplete advice on the topic of dealing with content theft.