i put 50 sites per 3 ip block. 2 for dns and 1 for web...
i host 350 sites per dedicated box
but i guess it depends on what you are doing.
i run adsense and amazon on my sites as well as cpa offers, so google is well aware of what sites i own..
i no longer see a benefit in seo by having your sites all spread out. i think the speed i get out of a beefed up dedicated box is better for what google is wanting to see..
i am sure other will disagree, but i am happy with the rankings i have so i will keep doing it my way...
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