I installed the same release of 3.0, also got my MMS activated today, no probs so far.i installed 3.0 last night on my phone and my wifes. Its been perfect all day.
version "iPhone1,2_3.0_7A341_Restore.ipsw" (which is the gold release and the version that will be on iTunes tomorrow.
infact half way through the day i got a message from O2 that told me my MMS had been activated.
i've had no problems with it at all.
From that same website -
Hold down shift while you press check for update and it will bring up a browser so you can point to the file.I'm downloading iPhone1,2_3.0_7A341_Restore.ipsw now - I assume I can just install it (option click on check for update) in itunes without being part of the developer programme? Is that right? I know it's coming tomorrow but I'm an impatient sod!