HVR-Z5U good demos on Youtube
 

Flash Tutorial on Sony's site
hdv_01

Product Preview Video #1 (you can also find #2~#5) by Sony
YouTube - Sony HVR-Z5 Product Preview Video #1

Slow-motion sample (probably shot by Z5U) by Sony
YouTube - Sony HDV slow-motion demo from Sony USA

Cool video by Sony
YouTube - Sony HDV products presentation

Good footage to check DoF by user
YouTube - Second HVR-Z5U test

Low-light comparison by user
YouTube - HVR-Z5e v VX2100 Lowlight Standard def Shootout

Enjoy !!