Done something bad in Terminal, now my dock has vanished and Expose is dead

Question

I was doing some minor tweeking to the dock, as advised by page 30 of Mac OS X Super Hints from MacWorld. I did this as in the magazine:
Add Spacers to the dock:
One easy tweak that will make your Dock more orderly is adding
spaces to separate your icons into groups. To add a space to the
applications area of the Dock, launch Terminal and enter this:
defaults write com.apple.dock
persistent-apps -array-add '{tile-
data={}; tile-type="spacer-tile";}'
To add a spacer to the documents side of the Dock, enter:
defaults write com.apple.dock
persistent-others -array-add '{tile-
data={}; tile-type="spacer-tile";}'
To see the changes you’ve wrought, type *killall Dock*
at the command line (see “Make Space on the Dock”). If you
want to get rid of the space you’ve added, just drag it off the
Dock and poof,it’s gone.
Now my dock is gone and Expose is dead (boxes in Sys Pref > Expose are dead), I have restarted and still gone and not responing. How do I get back to where I was, forget this fooling about in Terminal....at least not without a return map.
Leave well enough alone......MacWorld you are a seed of pain.
Cheers, SZ
more issues have come forth.....oh boy!
Message was edited by: ShakuZen

Answer 1

Thanks Niel!! I deleted the file com.apple.dock.plist from the Library/Preferences/ folder as you advised.
Can I get your cell number? I have a JavaScript/AJAX class all next week and this Terminal stuff-up does not look well for the week ahead.
Cheers!
PS: My dock has never looked so clean, I had sixty applications down there....now it looks like my wife's dock.