From Mashable:

Facebook had already shared its plans to help you clean up your now-cluttered profile, thanks to all those applications, and today the new feature has arrived. A new option for an extended profile basically offers a “page 2″ of sorts, so visitors to your profile can choose to see all those extra, bottom rung applications if they want to. Instead of seeing an ongoing stream of applications on your profile, they’ll now see a truncated version, with the option to see more.

From the looks of it, Facebook will detect which applications display at the bottom of your profile. You can select to move one or all of these apps to your extended profile. This can be edited at any time, in case you tire of another application that’s showing on your profile. A link on your profile will let you view your extended profile as well.

I've been watching the MySpaceification of Facebook for a while now, and shaking my head the whole time. It's proven to me very clearly that a lot of people, simply put, have no taste.

From a Facebook user's perspective this is great news, more control over my own profile to highlight what content I care about.

But from the perspective of someone who builds applications, this makes my life that much more difficult. Having your application shunted to the bottom/second page of a profile reduces its visibility exponentially.

But all is not lost, you just have to build an App that's cool and engaging enough that a user will want to place it on their profile's mainpage.