MacWorld.com has a brief First Look at FileMaker 9 that you should check out. See more of my summary comments on FileMaker Fever. Studio Manager 8 should be 100% compatible with FileMaker 9. We are testing to double-check on that over the next couple weeks.
FileMaker scripters will love the ability to clear clutter by putting scripts into folders in ScriptMaker and the new script debugging features in FileMaker Pro Advaced are essentials. FileMaker Server 9 has web features that previously were only available with FileMaker Server Advanced. I'll be writing more about FileMaker 9 in the next couple of months. I attend the FileMaker Developer's Conference in early August and will bring back the scoop upon my return.