Drupal 7.20 was released this week.
This is a security release, so upgrading immediately is essential.
Also, this is a good opportunity to check up on all your sites.
Drupal 7 releases have been coming rapidly over the last few months. Drupal 7 had no releases in its first 5 months, but has now had 5 releases in the last 5 months. 4 of those releases contained security fixes.
We’ve moved rapidly from 7.16 in October to 7.20 in February so please make sure that all your sites are up-to-date.