Facebook pages has gone through some changes over its short life. At one time they where called fan pages. Now instead of becoming a fan, you like a page. Up until now the conversation was limited for a page admin. They could only comunicate with other users on their page. This was a bit of a handicap compared to the freedom of a standard user. A standard user can comment on their friends walls as well as page walls. They can interact without waiting for the conversation to come to them.
With the recent changes to the facebook pages. The page admin can now log in as the page and comment on pages that like their page or pages that the page has liked. This is will be a great improvement in the ability of a page to join the online conversation. However it could lead to a spammier facebook. However because you can drop pages like you drop friends, if they begin to misbehave you can put them in their place.
The layout has changed somewhat also. This will make it interesting for the custom page layouts already on facebook. Who knows how much these pages will need to be changed. With a ever evolving Facebook, one thing is sure. Facebook guru’s will be busy keeping up.