try this video ^^
http://www.megavideo.com/?d=O365TEB4
its Boa - Energetic
I converted it
thats the one only one English..
I converted a lot of videos.. but they are Korean MV
I also converted Movies.. but I dont upload it
all my videos play really smooth and really high quality..
so just test it out~

and that video detail is here

Encode to File Format: MP4
Use Video Codec: MPEG-4, 800:432 (16:9), 9600kbps, 30 fps
Use Audio Codec: AAC LC, Stereo, 256 kbps, 44100 Hz

Converter by Shini

if you want to download Korean MV for N900 go to my Korean blog
http://blog.naver.com/lrb1000
no id require ^^ feel free to download

Bonus*
http://www.megaupload.com/?d=0MN2JYN1

SNSD - Run Devil Run
Encode to File Format: MP4
Use Video Codec: MPEG-4, 800:432 (16:9), 9600kbps, 30 fps
Use Audio Codec: AAC LC, Stereo, 256 kbps, 44100 Hz

as you can see its different are then Boa MV
just see different ^^ for me I put videos on my 32GB N900
and I put all my music on my 16GB Memory Card
I dont have any lags on Videos or Music playing