I'm not sure if the CSI/WWF Smackdown versions are on the net yet. I'm sure they will be soon enough, though.
As far as the 3/27 trailer, you'll have to explicitly save it as it won't automatically cache it. You can do this via a download manager, by owning QuickTime Pro 5, by checking the P2P systems like Morpheus or by cutting and pasting this (watch for line breaks):
http://a1568.g.akamai.net/5/1568/51/fdbdfdb3f5c3c3/
1a1a1aaa2198c62797... 669d84574a8d80d3cb12453c02589f25382f668c9329e0375e8177a
e955ca37990263920575d e42a71946b31482b1168ef15dd245ae2489/spiderman_fs1.mov
If that link doesn't work (I'm not sure if Apple changes it or not), you'll need to get to the screen that says 'Click here to play'. Somewhere within that frame, but outside of the 'Click here to play' box, right-click and 'View Source'. In the raw HTML, look for a link that contains 'spiderman_fs1.mov'. Cut and paste that into your browser window or download manager.