The latest version of OS X (Tiger) arrives on April 29th. I cannot express to you how sick this OS X is, and Tiger looks to be at least as much of a jump as previous iterations.
Of particular interest to me are the enhancements to Mail.app, and the new Spotlight feature. Of course there’s also Dashboard as well, but I anticipate this being more of an eye-candy feature that I rarely use.
Apart from these highly tangible feature additions, I am actually most excited about the general improvements that come with each new release, e.g. speed enhancements, GUI tweaks, etc. It’s this behind-the-scenes stuff that I usually appreciate most, and I can’t wait to sample the “feel” of this new version.