There's ways to have this done automatically for you.
Many of the sites, both official and unofficial have something called an "RSS Feed" available. RSS stands for "Really Simple Syndication." It basically distributes headlines that are linked to web pages.
You can get a ticker type widget for your desktop that automatically checks these RSS feeds at a specified interval and scrolls the headlines across your desktop. You set them to only display unread stories, so it's blank unless there's new content. It will consolidate the feeds from many places all in the same ticker, too.
I use FireFox for my web browser and it has something called "live Bookmarks' which are boomarks/favorites that contain a list of the linked RSS feed headlines. I also have an add-on RSS ticker for FireFox that sits up top below the menus and checks these 6 feeds every minute for new stories:
News stories posted on this site.
TUAW (The unofficial Apple weblog so i can hear about the iphone app announcement)
Google alerts for news stories with the word Sirius in them
Satwaves.com news posts
Sirius SEC filings from the SEC site
Official news releases from the Sirius Investor site.