From Marvel's new Thor movie website,
10.5s boot animation plays super smooth at 24fps on my D1 due to its tiny size. The audio plays in perfect sync as it came from the same swf source.
It's plain and simple, but I love it!
Both the bootanimation.zip and audio file are included in the archive. Extract and place in /system/media. Your phone must already be capable of playing sound during boot. If you aren't, read my first post.
Edited to add the oriented version, playing 90 degrees CW so you can watch it full screen. This one's a bit slow (not unbearable and the sound isn't a big deal) on my D1 but should play fine on D2 & DX.