With the new Facebook Page layout we can finally post or comment on a page with our personal account, or with the page account. Before this change you could only post or comment on a Fan page as the page itself.
You do have to be careful, if you do not switch back your profile you may find yourself posting via the wrong account.
One of the extra benefits to this is that you can now see who has liked your page last.
If you login to one of your Fan Pages at the top left there are icons for Likes and Notifications, if anyone has liked your page since the last time you were logged into the page you can click the Like icon and see who the new members are.