Pageflakes too, seems to be pretty popular choice of a Portal service. It is interesting to note that Google's Personalized Home Page or Live.com are no where close in terms of their number of users. Not surprising, since the extent to which services like Pageflakes or Netvibes allow customization is much greater than what Web-Giants have to offer. For instance, Netvibes supports readymade modules for Box.net storage, Yahoo Mail, Gmail, Del.ico.us, Digg, to name a few popular sources. Pageflakes offers modules for Zoho Writer, Alexa and even an Address Book.
While it is true that any number of feeds can be added by a user, the popularity of Netvibes and Pageflakes is proof that people want the service itself to come packed with a lot of features; proof that people want more.