GNOME 3 Delayed Until September 2010
supersloshy writes "Contrary to popular opinion, GNOME 3 will not be released in March next year. It has been delayed until September 2010, six months later. According to the news message, this is because 'our community wants GNOME 3.0 to be fully working for users and why we believe September is more appropriate.' GNOME 3's main goal is to re-define the ways people interact with the desktop, mainly through a new UI design (currently called 'GNOME Shell'), while GNOME 2.30, set for release in March, will have a focus on being stable. An early visual tour of GNOME 3 has been posted at Digitizor."
Try GNOME Do.
The "Docky" frontend is a fantastic dock experience as well.
You're looking for Katapult. And you know what - that was probably the first (or one of the first) apps of such kind.