Gadges.... Like iGoogle

[The Little Guy]

First off, here is the low down...

 

My sites has/will have many boxes, each box contains different content, and topics. So... if a user has a site, and wants to make a box that will do a certain thing, I would like them to allow them to add their customized own box.

http://publicsize.com - Here is the site. (Login: demo/demo)

 

You will see different boxes, and each one has different content.

 

I want the user to have their own dynamic box, but since it will be dynamic, I don't want it to run on my server, otherwise they can hack my server, I just want the boxes to return html from there server.

 

iGoogle has gadgets, and I would like something like that on my site, where people can make their own box to do specific tasks.

What would the best way be to do this?