From Stone to Steel is 3.0, but there isn't much of a difference between the two. Unless you've never played 3.0 before, you should be able to figure out how to convert the weapon sizes to the new format.
Holy crap! FSTS is fantastic! I just bought it, and I'm not usually one to impulse buy PDFs costing more than a buck or two.
A long time ago I picked up a box of old D&D books from a yard sale with a booklet from Palladium with all sorts of various weapons in it, and this reminds me of that. Except, of course, a lot more info!
It is also a monstrously thick PDF. After getting the PDF I really wished that I had sprung for the print copy while I could.
The books are good for getting ideas for a campaign as well, looking at some of the cultural information in F&F, and at some of the weapons in FStS can spark some odd ideas...
One of the odd ideas that the books stirred for me was an iceage neolithic game, with elfs as the bad guys., sending out lancers to hunt the cavemen for sport. No wizards, maybe some sorcerers, but more likely adepts being available for PC spellcasters. Dwarfs would be frightening figures seen only in the darkness, less aggressive than the elfs, more territorial, but willing to trade with the primitive humans, being their only source of metal weapons. I am considering having one of the things the dwarfs would be willing to take in exchange might be elf ears... The game has never gotten past the 'concept and a map' stage.
The Auld Grump
*EDIT* And for thse who do not venture onto the Publishers & Press Releases page - both PDFs are currently running at half price until Monday. If you are interested then now is the time to try 'em out.
Frost & Fur is great on the cultural details and horrid on the game mechanics. The classes, spells and feats are, on the whole, poorly designed. I don't use any of them, and I'm bummed I spent 30 bucks on the book. A $12 PDF with just the cultural stuff on the Norse, Slavs and Inuit would have rocked, though.