It is similar but a little less "onerous". You don't have to delete all the preferences. Only one of the dock preferences.
I had a similar problem and this is what I found:
Login into another account showed me that only my account had the problem. I looked for all the dock preferences and started by deleting one by one until the problem was solved.
You have to look into the preferences folder, inside the library folder, inside your home folder.
The preference that caused the problem was com.apple.dock.plist
This is what needs to be done (at least what I did. It might be other solutions)
1 - Open Terminal (I did this before, so I didn't need to "touch" the dock while doing all this)
2 - Move the com.apple.dock.plist to the trash.
3 - On the terminal type (without quotes) "Killall Dock" and press return.
The dock should revert the default, like when Mac OS X is freshly installed. This means that applications that you placed there, or arrangements you made, will be lost.
Because I subscribe to MobileMe, I just restored the dock from there. If not, you have to add or move the applications one by one.
If you don't subscribe to MobileMe, I would suggest to take a snap shot of a visible dock (Cmnd-Shift-3 or Cmmd-Shift-4) so you can restore it as it was before.
I hope it helps.
H.