Okay, so it's not a tip on any of the Creative Suite products, but I thought this was so cool, and I've already taken advantage of it. I read this in Design Tools Monthly where it was credited to Chris Breen.
If you're on a web site that doesn't have a search option, here's how to get Google to do it for you. In Google, type mysearch site:www.website.com, replacing mysearch with what you're searching for and put in the url after site:
For example, if you wanted to search for books on my site, you'd enter Books site:www.dcross.com
Try it yourself, it's pretty cool.