During the upgrade I had to edit configuration.php and I noticed that since this blog has been online I had a typo in the description metatag.
Instead of my "infamous" byline I had written Brian Teeman - agree or disagee... I don't care" />
There are many people who say that the metatags are unimportant and that Google ignores them.
Now was the perfect time to test it. How many hits would there be on google for they misspelt tagline.
It turns out that there are quite a few but none of them were to this site. They were all to bookmarking sites that had read the metatags and used it for the description of the link.
So whilst it might be true that google ignores the metatag description when indexing your site other software doesn't so you had better make sure you get it right.