Its a retro-clone. There are hundreds of them. This one, however, is awesome.
You get swords and sorcery as well as swords and planets in the same book. Twists on standard classes, as well as loads of new ones. There is a simple skill system and ... just tons of high quality content.
Production values are very high, and the art really conveys the feel of the rules well.
If you play any D20 style retro-clones buy this book, even if you don't play the game as written there is no end of ideas to borrow from it.
This book is a steal at this price.
The one thing I was disappointed with was the character sheet. The rest of the book is very pretty and then I got to the last page, blah. Functional, thats about it.
[5 of 5 Stars!]