If you want to see them all at once:

Select them all, right-click, choose "diaporama" then click the index button, you'll have an Exposé-like view.

I never use the diaporama feature except like this.

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iMac G5 20" 1.8Ghz 1GB 10.4.1 /
PowerBook G4 12" 1.5Ghz 768MB 10.4.1 /
G4 400 AGP 768MB 10.4.1 /
G4 400 AGP 768MB OSX Server 10.3.9

...for those using the English version of 10.4 :-)

And yes, I would second this recommendation -- it is very easy to do, and gives you full screen previews without having to launch an app.

Actually, the "slideshow" menu does start the preview application, and switches automatically to the full-screen slideshow view.

Move the mouse to see the actions.

For the mouse haters among us, you can also hit 'i' to get the exposé-like view of all of the images - I love it - now if only iPhoto would do something like this for the holiday snaps. (Don't you hate it when someone asks to go back to that pic we saw a couple of minutes ago? :-)

Cheers!