Portal for myself

What it takes to built a portal for myself?
I have been to Google and yahoo portals where I get to choose what news to read, choose the weather informatin for my selected cities, my preferred sports news and much more. yahoo also offers online personal calendar and yahoo mail + messenger buddies on the same page. So far these entities are external bodies, i.e they are not critical to my daily activities.
How about a portal for myself and not my.yahoo?
I would like to see my bank, credit card account status, forth coming bills for my auto, home, insurance, mobile etc. Also available are my spending for this month from various sources. This is like a one stop for all activities i do. This way I will not forget the bills to be paid, and I can watch my spending too.