Filibuster the way it's used today is a dirty hack. But Sen. Paul is actually using it legitimately by standing and debating/speaking instead of just declaring 'I filibuster' and going home (implying that he would speak forever but doesn't need to since it's merely a formality). It's actually the most refreshing political action I've seen in a while. They're talking through the night, live now: http://www.c-span.org/Live-Video/C-SPAN2/
He vows to speak as long as he's physically able.