Easy way to steps Web server cluster, check how you can build an Apache Web server cluster that spans multiple physical or virtual Linux servers in 5 easy steps with Linux Virtual Server and Heartbeat v2.
This tutorial is a good start for new Linux admin, check full description at IBM.

Hosting your application let you free from the burden of load of back up and security measures, since by hosting your application you are making your host providers responsible for securing the server and backup. This let you save cost as you need not worry about buying or leasing the equipments to run the third party applications or spend additional capital on training of your staff or consulting. You can utilize your manpower in your on-going development projects and other work because your staff will be free from that extra responsibility.
The hosting provider are also liable for backing up and restoring the applications in the event of a disaster and manage the server effectively and in addition they provide you technical Support, security management of servers, which also saves in equipment and consulting costs and gives you an free feeling of additional work knowing your applications are being backed up and taken care by someone.

Here is the video from Jason Bailey of Millnic Media that illustrate the process of Monetizing Facebook, though it does not have javascript embed code to facilitate adsense for content but facebook application have maximum prospect for developers those interested to use affiliate links and monetize it to earn revenues.

Facebook provides good opportunity which will see rising activity within the blogosphere for the coming months. Facebook’s growth is expected to someday go beyond that of MySpace itself. For developers and businesses alike, this is an opportunity that is well worth look at. Watch this presentation on youtube.
Monetizing Facebook Applications - Jason Bailey

{ http://www.youtube.com/watch?v=t6vjKo6Lzg4 }