Just found a good password manager program that works well on the A1200 called
Passwords Guardian. It is written by a Russian programmer but all menus are in English. It is easier to use than the SecretCodes app recommended in the FAQ's - but I have no idea how strong the encryption is.
Home page is
http://www.smpda.com/soft_utilities_03.html
Have attached jar file. Download and rename to remove the ".zip"
EDIT May 1: Do NOT use this program if you really need top security for your passwords. I investigated further by going to the directory where the midlet was installed on my phone and opened the database file using Wordpad and discovered that I could identify my passwords as they are stored in plain text!! So would not use this app for really critical passwords (though the likelihood of someone getting hold of your phone and knowing which directory to go to and then knowing how to open that specific file is probably pretty slim).
A pity as a well-designed app - wonder why the programmer failed to deploy encryption