I checked and it indeed disabled, surely because it relies to adwords APIs for traffic estimations, and there are serious problems with those APIs (also here with the kw difficulty tool. And yes, it is a paid tool, even though quite cheap respect others and surely worth the money, as it is meant especially for kw hunting and the ranking feature is an important but subsidiary feature. .

A still good rank checker is the free seobook one for firefox. On the other hand, I find extremely useful the keyword tool by SeoGADGET.co.uk that between it's features have one that show you the ranking of all the queries listed in Analytics and that have generated at least 1 organic visit.

Sorry... maybe I've just seen too many naive question in a too short frame of time

No... they are just awful.

Anyway... sorry to cite myself and link to a post I wrote... http://www.iloveseo.net/the-ten-crappiest-mythical-seo-questions-we-should-not-ask-anymore/

Without offence, but is it not better thinking to more relevant SEO problems?

30 posts per page surely increase the long tail of the forum page and can solve the pagination problem, even though that issue could be solved using the first forum thread page as canonical or using the noindex,follow meta robots tag in the pages 2,3...

If you do searches with regular expression and you have the SEOmoz bar installed, that way you can find what should be the most powerful pages for a keyword and kind of site (i.e.: blogs).

Not scientific, but the closest you can related to your question.