Apple just released OS X 10.8.5. It fixes a few bugs in Mail and makes Wi-Fi file transfers speedier. You can get it in the App Store now. [9to5Mac]
I'm still using Snow Leopard and have doubts about upgrading to Lion. A part of me feels like Leopard is the Windows XP of OSX. Am I paranoid fool? Should I upgrade? I use mine for work (graphic design, video editing), so stability is rather important to me.