Hello Eric,
Currently the RadTileVIew supports all kinds of dynamic changes to its items(adding, inserting, removing etc.) so the first part of your scenario is easily achievable. As to the second part, the saving of each individual's preferences, at the moment we don't support it out of the box, but we're planing to release a Persistence Framework for the Q2 2011 which will help you with this.
If you have further questions feel free to ask.
Kind regards,
Zarko
the Telerik team
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