Source:

http://www.telegraph.co.uk/technology/google/7765124/Google-Chrome-out-of-beta.html

Google has confirmed that Mac os x and linux versions are stable too now.

Several security fixes too:

http://googlechromereleases.blogspot.com/2010/05/stable-channel-update.html

And the non-affected version is 5.0.375.55.

What do you mean "non-affected?" That the supposedly-stable 5.0.375.55 version is the one with yet-to-be-fixed security issues [albeit stable], or just the opposite.

That this version includes security fixes mentioned.

For more details see
http://secunia.com/advisories/39882/