When I recently found out that anyone could register a .tk domain for free, I of course had to go register one.
The internet, being the information black market that it can often be, abuses the daylights out of this. Spammers, hackers, exploiters, and script kiddies the world over set up free, throw-away domains to do their dirty work. This has obviously led to some blanket assumptions about every .tk domain by many online services. Namely, Google. I have a few domains that I point to Google Apps because it's ridiculously convenient to use and it's free. Know what happens when I try to register my new tach.tk domain with Google? It gives me the finger. It gives me a bogus error message, even if it's the one and only domain I've attempted to register with Google in a week's time:
We're sorry... ... but your computer or network may be sending automated queries. To protect our users, we can't process your request right now.
Of course, if I immediately turn around and enter one of my other non-dot.tk domains, Google has no trouble acknowledging that I'm not a bot. So, the Google BeanCounter group has obviously decided that the benefit outweighs the negative and they've banned the entire .tk TLD and I get the 3rd class postage treatment Oh well, Posterous didn't thumb their nose at me, so that's where http://tach.tk ended up.