I am planning to deploy a portal for our company. The minimum features I expect are:
 

1. Google Calendar for each team member
2. New Emails Alert
3. Company Announcements
4. Latest News & Tech Trends (This has to be an RSS/XML feed so we can add popular feeds)
5. Cartoons or Jokes (Randomly appear every day)
6. Weather
7. Blogs (If our team can write and publish blogs, it will be awesome)
8. Custom Web URL (To load a page from our website)

Do you have any suggestions or ideas? Any software or service available like this?

yes it is.....

Thanks to all of you guys for sharing such a very useful information.