Like the OP there, it appears my private key is stored in unencrypted Base58 format (58 character private key, starts with '6') and I need to convert it to Bitcoin-qt format. Blazr's advice to the other poster seems to be just what I need to do - however, it appears Blockchain.info has now removed the Export tool from their wallet.
Is there anywhere else I can get my paper wallet address into the right format? Sincere thanks for anything you can suggest! -Craig
ps. cryptocointalk looks great! easy on the eyes

Reddit post can help.