I have just had an email stating my ESTA is due to expire in the next 30 days. I don't recall receiving similar emails before.
I applied on 20 May 2012 and thought it was valid for 2 Years. I have dug out the ESTA and indeed it does state expiry on 20 May 2014.

The link attached does take me to the genuine ESTA site rather than one that charges too much.

I'm not planning to travel again until later this year or maybe early next year.

Anyone with any thoughts or comments?