I have been using netvibes for quite a period. It provides a dashboard like interface for personalizing your page just like Google Personalized home, but it is much advanced including tab functionality and web 2.0 support. You can check GMail and Google Calendar here. It seems the main plateform that it is using, is Ajax – a platform for web 2.0 apps.
It also includes To Do lists, Webcal and Personal Notes. It is already available in English, German & French Languages and provides 1 GB storage space but still it is in beta stage – so no reliability os data is guranteed.
I have been searching for somtime to get a link for letting users add my BLog to their Netvibes account and today I found one here at netvibes blog.
Good to give a try at least!