Delivering Custom Content

Hello there, My CS clan has just starting using phpBB for our clan forum. We are planning to develop a new php based site and wanted to be able to display customised content on the main page depending on the user logged in. For instance, I was thinking of having a login box in the corner of the page, and once logged in, you could navigate to the forum without having to sign in again. Also, because each user has their own profile, I'd like them to be able to choose what content/news/announcements they see when they go to the site etc. An example of stuff like this in action is CS Nation. Is all this rather ambitious, or can any give some advice/pointers/sources of info to go on? Cheers, Monk's