A similar extension exists for J1.5, but since it hadn't been updated - I created a 2.5 compatible version.
Usage is simple - enable the plugin after selecting which user groups will be prevented from password changes. When saved, the users in those groups will not be presented with the password fields when editing their account details. Additionally, it prevents submission of passwords (just in case someone decides to submit the password field values anyway by hacking the form).
4/26/2012 - Joomla 1.6/1.7 availability and support withdrawn.
All of my extensions are free and none of my extensions display advertisements or links to my sites or services. If you feel that I have blessed you, then you can bless me by making a contribution to fund future development. Visit the "Website" link to make a contribution.