Preference Manager 1.5
the author of this app says:
Preference manager allows you to manage and control your handheld's preference database which is used by almost all applications to store preferences, state information, expiration dates and more. Preference manager saves memory by mapping all applications that use the preference database and distinguishing unused (orphan) preferences that were left there by applications that no longer use them. Preference manager can be used either to clean orphan preferences or 'hidden' preferences which are used by several programs.