Because I want to do more with my site than blogging alone, I decide top switch from BlogEngine to mojoPortal. MojoPortal has many possibilities. So I think mojoPortal will be fine for me.
Managed Extensibility Framework (MEF) is an interesting technology. On Channel 9 you can find webcasts about MEF here.
On Channel 9 you can find the videofeeds for DevDay 2010 Netherlands.