Drupal 7 meta tags FAQ: Is there a meta tags module for Drupal 7? (Or, what's going on with the Drupal 7 meta tags module?)
(Note: This article was last updated on March 24, 2011.)
Having just gone through the meta tags process with a Drupal 7 website on February 9, 2011, here's what I know:
In short, if you're looking for a Drupal 7 meta tags module, those are your only two choices right now: (a) write your own, or (b) use the Quick Meta Tags module.
FWIW, I started using the Quick Meta Tags module yesterday as I'm building a new Drupal 7 website, and it has worked fine. As the author writes, this is not as good a solution to the problem as what the Drupal Nodewords module offered, but when you have Drupal 7 sites going live and you need meta tags, this is a good solution, and again, what I was going to do anyway.
Of course you'll have some migration work to do if/when a Drupal 7 meta tags module, but the way it looks now, you were going to have to do some migration work from Drupal 6 Nodewords to Drupal 7 Meta Tags anyway.
If it helps your Drupal 7 SEO cause at all, I've read that Google hasn't used meta keywords for years. That being said, they do use the "meta description" field for display purposes, so you really do want to have a "meta description" field in your pages.
I hope this Drupal 7 meta tags information has been helpful. I'll try to keep updating it as time goes on, and I learn more.