i like seomoz.org, and many people follow search engine roundtable (.com?), search engine watch, and I've heard good things about SEO by the sea, whose author is recommended by seomoz...
Of course, you're also welcome to check out my own blog  (sig).
As to rankings...
Google: BACKLINKS. they came up with the technique, and are still very preoccupied by it. Hence google-bombing, where a bunch of backlinks with specific anchor text make a particular site rank for a term it didn't optimize for.
Yahoo: Backlinks, del.icio.us tagging (social search anyone?), and on-site optimization.
MSN: on-site, light backlinks.
They all give pretty accurate results, but google is toughest, and yahoo is sometimes a little eccentric about what it will rank or not.
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