Many times when a new Adobe CS version of Photoshop or Illustrator comes out, some people believes the tools doesnt exist in CorelDRAW, which many times isnt true at all.
Adobe Illustrator CS3 and the new CS4 are very good softwares, at the same time it doesnt make CorelDRAW any less great. Like many times before CorelDRAW X4 already have a tool like this. Its called the Smudge Brush Tool, and you find it in the flyout meny for the Shape Tool, in the CorelDRAW toolbar. Check it out, its a fun and great tool to use. See attached sample image. You just drag the Smudge Brush Tool on top of the shape or object you like to work on.
Illustrator & artist