The thread name has to be changed...
yup, I think wallets before May has clams in it.
Answers it
The client needs the keys to prove ownership of the BTC, LTC or DOGE that was in the wallet on 12th May. The keys aren't sent anywhere and the client has been fully checked out and approved by several extremely trustworthy individuals (including the owner of just-dice). If you're still not comfortable then you can always send the coins to a new wallet and then import the now empty old wallet. The keys don't leave your machine but are used to generate the CLAM addresses in your CLAM wallet that would have qualified.
You'll receive CLAMS for any non-dust containing output in any of your BTC, LTC and DOGE wallets:
Bitcoin
height=300377 date=2014-05-12 12:48:17
Litecoin
height=565693 date=2014-05-12 13:06:31
Dogecoin
height=218556 date=2014-05-12 13:09:17
You only need the keys if you intend digging up/claiming CLAM from the distribution and you believe one or more of your wallets would qualify. Otherwise you can just buy and sell them like any other altcoin.