I think shortcuts are quite an important aspect to a program and can save time and confusion along the way. So i found some .pdf files off a site which shows all the Programmed shortcuts for the Photoshop applications.
<PC>
Photoshop CS3
Photoshop CS2
Photoshop CS
Photoshop 7
Photoshop 6
Photoshop 5
<Mac>
Photoshop CS3
Photoshop CS2
Photoshop CS
Shortcuts are a great way to learn your way around a program and i advise you take at least take a glance at them
Enjoy!
- Puff