I haven't seen most of those hints before. I really like the PDF stuff.
I'm a little disappointed that the Spotlight search in an Open dialog is not a full-featured Spotlight search. For example, you can't put in a word or two of the CONTENT and find the document (Spotlight eats that one right up!) Also, when you find a document, I didn't see any way of finding out where it came from. That's particularly troublesome for people with multiple copies or those who aren't creative with generating new names.