I was looking for audio tracks to turn into Disneyland-related ringtones and soon found myself captured in Youtube's mighty grasp as I bounced from one "video" to another of actual ride audio tracks.
There are plenty of videos people have taken on Disneyland rides, but I like these better: If you pop in your headphones and close your eyes, the audio tracks will take you right back to the park whenever you want. At least some of these are/were available on CD, and please post links if you know good ways to get those recordings now, but below are links to my favorites.
Oh, and while it's not as easy to get audio from Youtube videos as it used to be, it still can be done (I used Garage Band and a cable linking my headphone jack to the mic input) and you can make MP3 audio files for your iPod from these videos, too. Warning: Do not listen to Space Mountain audio while driving! You will end up accelerating to about a million miles per hour and get a huge speeding ticket.
Space Mountain (current in-flight audio)
Space Mountain (old surf guitar in-flight audio)
Space Mountain Queue/Background Music
Haunted Mansion (full audio, pre-Bride):
Pirates of the Caribbean (full audio, pre-Depp, includes disgusting sweat-bellied pirate spiel):
Tea Cups (only 59 seconds)
it's a small world (you know you want to listen!)
Many of these are from MrThemeParkAudios who has a huge collection of recordings from various parks, including background music like Main Street loops, etc.
Disclaimer: I am not an expert so some of these could be from other Disney parks or otherwise not exactly what I noted.