Just went to log into my PS3 and it said my password was incorrect.

After a bit of research I found this:
We monitor PSN account for any irregular activity. If such activity is detected we will sometimes reset passwords.
This was done purely as precautionary measure and there was no specific evidence that any accounts had be compromised.

Only a small number of users were affected by this and as I said this was precautionary so there is nothing specific to worry about.

I cant provide any further details as this would affect out ability to keep you guys safe.

If anyone has any concerns about there PSN account drop me a PM or give PlayStation Support a call.

You should also contact Support if you are unable to reset your password for any reason.

Source: http://community.eu.playstation.com/...0145423#M33791

Time to reset my password

Edit: Just a thought - Adobe was hacked recently and I know that Facebook alerted people who had the same password to change it. I believe my adobe and sony password was the same. It could be related.