Tom Hanks and Halle Berry are the obvious big-names, but Hugo Weaving, Hugh Grant and Susan Sarandon make more than a few cameos. Each actor in the cast plays upwards of three roles a piece. Pretty cool trying to pick them out in the different costumes and make-up.
As for the CP stuff, they had some pretty cool touches as well as the usual fare. They had laser pistols and personal flying vehicles. They had wall screens and digital decor in apartments controlled by a neat little remote, just point and change the wallpaper. The had a vat-grown labor force of 'Fabricants', who staffed the businesses of Neo Seoul. Old Seoul having been flooded by rising tides.
Anyways, if ya get a chance check it out. At 8 mins shy of 3 hours, I found it totally worth it. Oh, and by the way. Note that I believe it was Larry? Wachowski, is now -Lana- Wachowski, having had a sex change. Perhaps all the leather and latex and the lovably androgenous Trinity, should have given us a hint in the Matrix trilogy?