so it must be something on your system that is causing the problem.
I've finally solved it with some help on the Adobe user forums.
The problem seems to be that having disabled all the scripts I thought unnecessary in the preferences options, I found the Photoshop option on the tools menu had gone. However re-enabling the preferences failed to return the options to the menu.
The solution was to reinstall Bridge, patch it back up to 2.1 and delete all the Bridge preferences on start up (Hold down Ctl+Alt+Shift on Windows) then accept all the defaults and the menu options returned.
Whilst this maybe an isolated problem on my system, it may also be a bug in Bridge too. However you may only see it if you disable the scripts and then try to re-enable them, a situation not many people may have tried yet.
I'm afraid I haven't the time to test this much further now it's working again for me.
Yes, I did have the beta on here in the past, but it was fully deleted according to all Adobe's instructions well before installing CS3. I have had no other problems others have reported that are beta related.