A few people have reviewed the new online application, Nozbe, for getting things done. Of of these reviews that is worth reading is the review from the Getting Things Done Blog. The official Nozbe blog is also worth a read.
I have found these three Tutorials on how to use Nozbe via YouTube. Be sure to check them out.
Follow the link to view the other two videos
This is the second Nozbe Tutorial Video
This is the third Nozbe Tutorial Video
Be sure to check Nozbe out and make your own assumptions.