Article Directories as Web 2.0's?

I'm getting ready to do some link pushes and have been reading about how people are using Web 2.0 blog platforms for this.

My question is are article directories still effective as properties in these pushes or should I stick strictly with the blogging platforms?

Thanks

Article directories works allmost the same

It depends on the directories. Rather than make a blast of 100s of low PR article sites, I would focus on 4 or 5 on the good high PR sites....