iGoogle/Netvibes Like Portal Framework

I want to create web site like igoogle or netvibes. i.e. functions of multiple sites should be able to perform from a single site. I have few question to clarify for this

1. What are the available free/Commercial frameworks?
2. What is JSR / Portlet?
3. I have basic knowledge of doing this using div as a windows and loading them from AJAX. Is there any other technique other than xhtml and javascript/Ajax?
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shanikawm, did you get your solution?
shanikawmAuthor Commented:
What about my 2nd and 3rd points?
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