i skimmed your guide and gave a few of your tips a go, they worked here's my last 2 games as Olaf, thanks for the guide bro.
http://www.imagebank.ie/UserPhotos.aspx?yp=1&uid=27700933-c3a6-4ca4-8f77-1c3b4beabb13

Im diying too fast at the early-mid game when I have boots, spirit of golem, and sunfire. Hard CCs on my ultimate CD and DRAVEN winning all the trades. Draven can kill me without moving, he didn't even run cause he hits me so hard that can kill me without help.

Look at my maches you see I can't won against Draven.
http://www.lolking.net/summoner/br/648236#matches

Not that great.. I've seen better. Its ok but..

i like this guide but have one porblem i don't like Spirit of the Ancient Golem if you want have my vote please change this item and choise for exemple life steal with health regeneration and cooldow reduction

ok i go vote in this guide but please change

I'm sorry guy but -1 for you. The guide needs a complete overhaul on visuals, explanations, basically everything. Also the organization leaves a lot to be desired, example being placing jungle route and items before everything else then putting summoner spells basically last. Also why did you split items into items at the start and alternative items at the end. Not trying to sound like an *** but saying that you should start with long sword in the guide(not the cheat sheet which seems to be up-to-date) instead of vamp scepter is like "... wtf??!?!??!". But yeah, so many small things that need to be fixed and a few large things as well. Not trying to be "that guy" but in this case someone needs to.

I think it really depends on your play-style. I made this guide, to inform the reader about how to play Olaf, and is not about the build or skill order.
Many people indeed do max W first, due to it's damage and sustai it gives, but I personally prefer Undertow, as it allows you to clear jungle quickly (you wouldn't be just ganking, and this would reduce the period of time you have to stay in the jungle, allowing you to get more ganks), it allows you to gank more effectively, due to it's higher amount of slow, which would make your ganks more secure. The higher damage makes your clear faster, makes ganks more secure, and in teamfights, you will be able to spam your Undertow, therefore I believe the +45 damage on one skillpoint is the most effective, even more than your Reckless Swing due to the lower cooldown Undertow has.

I totally like this guide , but there is one this that I don-t really understand , why upgrade the first spell its just a slow + dmg , but its a bit useless . I played sometimes with it and im uprading the w because it make lot of damage while you have bought life item , so it-s more use full i think . I want someone to explain me why the q is chosen here , i am sure that my thought is wrong because you guys approved that . Thank you for answer and sorry for my bad englsih ...( im french )
by the way my name in the game is the same as here urosKaus , maj K i think.

Yup, I like 9/21/0 aswell, gives you the sustain, and the 1.5% max health is great on Olaf late-game :)

I like the build etc =) Tried both 21/9/0 and 9/21/0 masteries and both seem good =) I like the 9/21/0 more tbh +1!

great guide, but personally, i think the begin should be a little be different: when i jungle (with the exact same masteries and rune pages) i manage to be finished with wraiths with over 40seconds CD on my smite, so i kill golems before doing red, just a thought.. ^^