The Buzz Lightyear Space Ranger Spin has a different controller (I think, but now I can't remember
![rotfl :rotfl: :rotfl:](http://www.wdwinfo.com/images/smilies/rotfl.gif)
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The controllers are fixed to the ride car's dash board in WDW, whereas in DL they are tethered (via a cable) so it's easier to move around and shot at things in odd places. You can also send your ride photo for free from DL via email.
As others have said Pirates (while some elements are similar, especially in the middle), the ride at DL is longer (and I agree, better). Also, be aware, the drops a little more pronounced at DL than at WDW.
Unlike some of the PPs, I think HM is better at WDW (I like the staircase and library scenes which are not in DL). Still depending on when you're going, you might see HM Holiday, which is a very different ride. If you like Nightmare Before Christmas, then you'll probably like HMH.
Along with the rides mentioned by skier_pete, the Monster's Inc (DCA), Roger Rabbit Car-Toon Spin (DL), Sleeping Beauty Castle Walk Through (DL), rides over at the Boardwalk area of DCA, and Bug's Life area are also "unique" to DLR. While also at both parks, I would consider Fantasmic different enough to count as different and worth seeing.
There are lots of rides that are similar, but have some minor differences. For example, Small World is pretty similar inside, but I like Disneyland's exterior better.
The Disneyland board's thread, A DLR Guide for WDW Vets, is full of helpful information:
http://www.disboards.com/showthread.php?t=1162599