I shot video with a Canon HF20

I need help with know which software is needed to edit the files from the video camera.

I use CS4 Premiere Pro to edit my work.

Any help would be extremely appreciated...! :)

I use CS4 Premiere Pro to edit my work.
Any reason you can't use that? Just copy the files from the camera to your computer. HF20 files are supported: Supported file formats in Premiere Pro CS4 (http://kb2.adobe.com/cps/405/kb405978.html)

You might want to consider an intermediate such as Cineform, AVCHD files are quite processor intensive.

I would agree with Stuart, Neoscene makes a huge difference