duplicate meta descriptions All in One SEO Pack Troubleshooting Forum

Google says my blog has loads of duplicate meta descriptions.

Those are found in long posts that have been split into two or more pages using WP's !–nextpage– code, e.g.,

http://www.altfg.com/blog/awar…..w-members/

http://www.altfg.com/blog/awar…..members/2/

The meta description for both pages is the same (the initial 20 words found on the first page of the post).

Is there a way to change that — so the 20 first words of *page 2* or *page 3* and so forth will show up as the description?

(The problem seems to be — and this a guess, as I'm pretty ignorant at this — that the "canonical url" shown on the "view page source" screen is the same for both pages — or for all pages belonging to any particular post, e.g., link rel="canonical" href="http://www.altfg.com/blog/awards/oscar-2009-academy-invites-new-members/" is the same for both page 1 and page 2.)

I'm using WP 2.8.

Any assistance would be much appreciated.