Apple - Mac OS X - Tiger Preview. Steve Jobs has promised that this version will have more than what Longhorn promises to do. Searching seems to be the center of every one's universe now, and Apple doesn't want to lag behind. But the website isn't clear on whether Apple plans to incorporate a broader set of features as WinFS, or do they will just be content with faster search for the contents of the Mac.
Another thing that's interesting is Apple's move to get a RSS reader into Safari.