I received a few emails from drupal.org suggesting that there were security flaws with the Drupal core for versions before 5.6, and that if I wasn't up to 5.6 I should upgrade. So, I followed my own instructions from the last time I upgraded (http://www.drupnewb.com/node/26), and things went fine. I must admit, that the first time I upgraded Drupal it seemed difficult. This time it didn't seem difficult at all.

Unless, of course, my site has some big problem I haven't noticed yet.

Not sure what benefits this upgrade has besides patching the security flaw.