Hello, Now that the registry patch landed, it looks like the time of $op might be over. General hooks implementing different branches with $op will always be loaded regardless of the exact need for them. Larry already suggests using the more granular *_preprocess_hookname() type of callbacks instead of the generic *_preprocess() callbacks for theme stuff, so that only those needed will be loaded. Take nodeapi for example. Code for loading nodes might often be needed, but not code for updating or deleting them, right? Those could easily be admin.inc stuff. So what do you think about $op? Should we evaluate on a case-by-case basis to make function level callbacks out of $op's or just do it wholesale (no, I am not volunteering for a patch) to get an overall consistent API. Gabor