I am fairly certain this went down in the Snow Leopard update but I just spent the better part of 10 minutes with my jaw agape because nowhere in Preview could I find a way to delete a single page from a multi page PDF.
One used to be able to simply hit command-delete and that would do the trick. Now that key combo unceremoniously sends the entire file to the trash.
I looked in the menus and contextual menus and found nothing, well I did find a full menu item dedicated to inserting a blank page. WTF?!?
Well, turns out Apple didn’t completely leave us in the lurch, the key combo exists, it’s just not documented. Anywhere. Drumroll: highlight the page in the sidebar and hit option-delete and voila. I know, it’s not that revolutionary as a key combo, but it’s something.