blog typer thing

Hi Everyone, I want a site simlar to [login to view URL] I want a search box which searches any articles added to the site. Via admin panel i want to be able to add article categories which are placed at the top of the like on this website. When i add an article via the admin panel it allows me to include images, hyperlinks.. other html etc. At the end of the article i select the category which i want the article to go into.. If i go to that article category all articles for that category will be listed there (in the same layout as the example site above). Each article category to include it's own RSS feed. When an article is added i want a little php script which displays the first line of the article saying 'Latest article Added + Date of article'