One useful delivered component is the View Menu Item Detail. With this you can search for a CREF if you know part of the Name or Label. This component will tell you who can access the CREF, it's menu path and it's component.
Menu Path:
Main Menu -- PeopleTools -- Portal -- View Menu Item Detail
Another way to search for CREF data is using the database. The delivered PSPRSMDEFN table contains all sorts of data related to CREFs.
SQL Table: PSPRSMDEFN
The PORTAL_REFTYPE field will always contain a value of 'C' for Content or 'F' for Folder.
If the URL type of the CREF is 'Peoplesoft Component' the Component and Menu will be stored in the PORTAL_URI_SEG1 and PORTAL_URI_SEG2 fields, respectively.
If the URL type of the CREF is a Peoplesoft Script then the Record, Field and IScript name will be stored in the PORTAL_URI_SEG1, PORTAL_URI_SEG2 and PORTAL_URI_SEG4 fields respectively.