Just installed Leopard, System 10.5 for the Mac.
So far I like it just as much as Lifehacker:
1. Mac OS X Leopard (Operating system, most improved)
We were nervous when Apple delayed the release of Mac OS 10.5 because of the iPhone this year. But when it finally did drop in October, Leopard didn’t disappoint. Over 300 new features include lots of polish and functionality you knew you wanted (and sometimes didn’t). We’re fans especially of Time Machine, the improved Finder, Stacks, Spaces, Quick Look, and Boot Camp. …

I’ll post any problems I encounter as warning for those thinking of upgrading or getting a new Mac this year.
So far, so good. However, Apple was very slow shipping my install DVD. When it finally arrived, my manual is in French only. (Fortunately Men do not read manuals.)
I watched the official Apple – Mac OS X Leopard – Guided Tour video (20min) instead.

At first glance, the most compelling reason to upgrade is cover flow in the finder. Find things visually rather than searching for them by key word. Sexy!
By comparison, CNET rates Microsoft Vista – “Worst Tech Product of 2007″
Hey there,
Just wondering if you are experiencing mac deep sleep problems with leopard? Sometimes I’m finding it difficult to wake up my MBP sometimes.