Apple just released OSX 10.8.1 Mountain Lion via Software Update. The delta update weighs a paltry 7.28MB on my Retina MacBook Pro, but your mileage may vary. Apple did not confirm reports that 10.8.1 improves battery life but many other issues appear to be resolved.
A rather intelligent friend of mine told me that when Apple comes out with something new it’s always best to wait for the stable release. That usually is the next release and typically means the point-one (10.8.1) package.
In this case he was definitely right. My computer has been slowing down like a hog in mud. It’s good to have this release.