Im surprised there are no threads on this, so here you go
Hashrate.org and nxtp00l.org allow you to automatically mine the most profitable SCRYPT or SHA-256 coins (nxtp00l.org offers X11 coins)
and the pool will automatically exchange your coins for NXT!
Its a great way to earn NXT without the hassle of manually pumping and dumping your coins and then converting to BTC etc.
Hopefully these pools will help drive further distribution of NXT!