Pwnthis

Thanks to everyone who participated.
Marco has won the following items:

Solution:
I said: Clues to previous round was given here.
http://www.pwnthis.net/2009/12/treasure-hunt-round-2-clue.html
Where would I hide this round's clue?

Now, that link is for round 2. Just change the 2 to 3 and you get
http://www.pwnthis.net/2009/12/treasure-hunt-round-3-clue.html

The twist here is that, speedoflight seems fishy doesn't it? Italicized and sticked together. If you think it's fishy, you are RIGHT! It is the keyword for Round 3.
So using it, you will get
http://www.pwnthis.net/2009/06/speedoflight.html
And hence the answer.
I hope everyone had fun coz I did! =D