Since no one else is answering your question:
Yes, you can still have btc sent to any old addresses mybitcoin.com generates and they should show up in your wallet.
I wouldn't be so sure about that. I had a transaction sent to one of their temp addresses when i was testing a payment module for prestashop that never ever arrived at my account! 5bitcents that got "lost" someplace in the block chain.
Too bad i don't know which address anymore or i would show it to you...