Here's a little story. Two weeks ago, i found a keyword with 14k+ exact local search, cpc ~$1, low comp. Both of the .fr and .com EMD were available. I bought the .fr, because my keyword is in french and it would be easier to rank. Today, i had a look at my ranking and i found the EMD.com ranked with a site. I was like "F****CK, why didn't i bought this stupid domain ?!" So now, my site is still not finished, i've only setup a wordpress and wrote like 100 words or something, i don't care about the ranking, but about the fact that now i've a competitor. The moral of the story, if the same domain as yours is available with a good extension: BUY IT. I know this is not a news but whatever... Well, now the serious part: due to the fact that the site of my competitor is new, should I blast his site with 100k dirty links ?