Currency of the Web
Jill Walker says links are the currency of the Web, and Google seems to agree.
"Everybody needs money. That's why they call it money." -- Mamet
Personally, I think audience is the currency of the Web, and links are they way we get an audience. After all, a kroner is a kroner wherever it is, while a link from a serious and widely-read weblog is worth more than a link from (say) a geocities home page that's been untouched since 1998.