how are they chosen?

When user's send you links... this is where they end up. 

Very shortly... when you see a link in a clickstream... you'll be able to click to make it a favorite 

any chance that we will be able to directly integrate favorites into magnolia/delicious?

great idea!

do you mean like import them? or push them to magnolia/delicious?

just a simple link (perhaps a delicious/magnolia) icon that pops either the magnolia roots window or the delicious popup. Kinda like what you see in the footer of the blog. Since you already know the user associations about what services they use it would be even slicker if you showed the appropriate one (ie I am using magnolia, show magnolia, I am using both show both). Really it is simply just a link.

Oh, so you mean a user could click the magnolia icon next to a link in the favorites page to send it to mag?

Yeah. very simple integration... just so users using those services can choose to keep their bookmarks in one place.

Great idea... thanks! 

That is a great idea, I have so many different sites on the go, the more integration there is the better for me.  I'm getting easily confused / forgetful in my old age. 

Something also that would be nice for all the favorites data http://microformats.org/wiki/xfolk

Xfolk has been implemented for your Cluztr favorites 

full implementation will happen shortly