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I've notice that the Serp for some keywords are updated more frequently then others (or am I mistaken?) Do any of you have any data that might support that theory? what seems to be the longest periode it takes for a SERP to update for a certain keyword? Is there any rules of thumps on this matter?

I've read several times of this technique for determining if a particular keyword phrase is worth the effort of optimizing for in organic search. In Adwords create an Ad Group with a single exact match keyword phrase and let it run in Adwords until you have enough clicks to measure valid results (I've often heard 200-300 clicks). If you are unable to convert the search term via paid search, the theory goes, it's probably not worth the effort to rank top 3 for that phrase and you should put your efforts elsewhere. Do any of you use this strategy? If so, have you found the results to be pretty consistently accurate? Thanks, Mark

I have a list of about 500 keywords, and I want to know the search volume for each one, such that I can select a list of 200 keywords with the most search volume. If I have all my keywords in SEOMoz (or in an excel file), is there a way to run this as a batch request instead of using the SEOMoz keyword research tool to test each one one-by-one? If this is going to require a dev to work on it, any estimates on how many hours this would take a backend dev to put in place would be appreciated!