While the patent is pending, they have no rights to do anything, at all. You could infact write a just as ánal retentive email back, saying that while patent is pending they have no rights, any further communication will result in action being taken against you for harassment and frivolous legal threats. The US law on Patent permits that it is illegal to use the term Patent Pending in the wrong way, and companies can be fined heavily for using it to decieve the public.
Most patents are published 18 Months after application, and any member of the public can request a copy of the patent application (just to check it's real).
But let's make this clear, Patent Pending does not "really" exist, the Patent won't exist until it exists! Besides, I doubt any patent will be given that infringes an idea already created, or a patent that will hinder the development of future sites that can benefit the Internet community.
Please follow my adivce carefully and don't take it as a life lesson  for now, email them back asking when they filed the patent application, under which jurisdiction and the name or company it was filed under, that way you can search for it at a later date. Also tell them to take a look at these website about patent pending:
The Patent Place
USLegalForm.com
Hope that helps, and also remind them about OpenSource, and insult them with a yo-mama line.
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A lie gets halfway around the world before the truth has a chance to get its pants on. - Sir Winston Churchill
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