According to http://exchange.bitparking.com post on April 8th, 2013:
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Work is still ongoing in recovering the transaction and wallet data from the exchange drive. I'll report here when I have more information. If you have data that will help identify you as the owner of an exchange account please send it to the email or bitmessage address at the bottom of the page. An address you deposited to or withdrew from and your account name, contact details and a namecoin/bitcoin address to send funds to will speed things up. Those that have already sent details I'll contact within the next couple of days all going well.
I would contact btcguild directly about acquiring previously mined namecoins. I am not sure what their policy is and/or when they ceased mining namecoins.
