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In order to call i always prefer gtalk .However yahoo has been a life saver for me used it for 5yrs and i dont think i will move to gralk.

Men orkut is just trying to imitate myspace.They have mainly userbase from india ,brazil and europe which aint much profitable.
Moreover myspace is more globalised give a better environment.

They can have same meaning but make sure it includes the main keywords of your site.And dont overcrowd your meta tags use wisely.

Great share .I think you missed the proper tagging.In SEO tagging play very crucial role and cant be avoided.

Anchor text is the most important for SERP(search engine rank position)
And one carefully put anchor text on all inbound links

Yeah keyword is a most important factor.The keyword must be choosen i such a way that it dosnt have much competitors for that particular keyword and more it should be dictionary word.

Man not sure if using too many tags help.I see there is no point using more the 4 to the point tags.Using more tags doesnt much help.
But anyways great share

You might have the traffic but its not necessary you will have PR. Page rank decided just your ranking for that keyword relatively.Remember it somehwhat relative and has variety of factors.