I have done a few trades on the site and deposited and withdrawn small amounts fine.  However, as soon as I deposited a large amount, I was locked out of my account.

I have sent messages to dima1236 on this forum and also tried IRC who said he helped develop it and also emailed the address that is on their front page.  However, 6 hours later I have had no replies so fear the worst i.e. the site is a scam.

If anyone from 0daycoins does allow me access to my account then I will post here but for now I would avoid it if I were you

** Update **
IRC chat with dima1236 sorted out my problems in an instant.  Now have full access again !!