Apple said there are over 200 new features in this version of the OS. Mac OS X is built on Unix and APple includes Xgrid distributed computing, the Korn shell, HFS+ aware tools and 64 bit addressing. Apple is very excited about the Dashboard feature that uses so called widgets to give access to share prices.
Also included in this new OS are Quicktime 7 and H264 (which Apple claims is the next generation MPEG standard that will work with mobile phones.)
Tiger requires a minimum of 256 MB of memory and will run on any Macintosh computer with a PowerPC G3, G4 or processor and built-in FireWire.