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As you probably know, the idea of +1 is personal recommendations - so you can see what people you know gave the thumbs up to.  As to whether Google will use it as a ranking factor or not, they are suggesting they might, but cautiously:

"This is just one of many signals Google may use to determine a page’s relevance and ranking, and we’re constantly tweaking and improving our algorithm to improve overall search quality. For +1's, as with any new ranking signal, we'll be starting carefully and learning how those signals affect search quality".

http://www.google.com/support/webmasters/bin/answer.py?answer=1140194

I guess the problem is that +1 signals could be manipulated like almost anything else so they will be treated as just one factor, in the context of many other factors.

Jen

I have the same problem.  I was able to edit before but I upgraded to the latest version of FIrefox and it stopped working as Yumi Chowi has described.  I'll try and report it.

The placement of these tags within the head doesn't matter - Google and the other search engines will find them - but Wordpress sometimes seems to put a lot in the headers which isn't great and less code is always preferable for SEO.  There is a good article on meta tags here by Kate Morris: http://www.seomoz.org/blog/the-wonderful-world-of-seo-metatags where she says: _"Think about it like this, your page code is like a set of step by step directions to get somewhere, but for a browser, extraneous meta tags are the annoying 200 feet line items in directions that tell you to stay on the same road you were on!". _ So strip out anything not needed if you can and just have the core tags that you need.

She also answers your question regarding keywords - that is, they're not necessary and there's no point spending time optimising them.  If anything, they're a negative because they tell your competitors what keywords you're targetting!

Hope that helps,

Jen