Hi. I also set up a blog at wordpress.com using Flock. At first I didn't receive the password via email.
However, I tried just now to use the retrieve password function (the "Lost your password?" at the login screen) and was successful.
I had also sent an email to Donncha (though I only sent it earlier today).
Yesterday, when I first used the retrieve password function from the website, I got the following error:
The e-mail could not be sent.
Possible reason: your host may have disabled the mail() function...
I guess this could have been some server error as I had tried using both Flock and Firefox as browsers to have my password sent.