old seo contest sites are great for this

[seocontest]

a month after the contest is over and the results are farly stable you can test links title change adding and removing h tags and other content to see what google likes and dislikes

What I have found is google puts a lot of weight on title and h tags but don't over do the h tags

it helps to have several sites in the top 50

I let you know a few more things after the contest is over

[remoradea]

One H1 and a few H2 and more H3, that's the way a document should be strucutred...