Ok it was because i'm planning to buy an ipod touch, and i think it works on a higher resolution than the other ipods, so i can see videos with better details.
No problem. You'll see they have an iPod touch specific version which I've heard has great results. Right now we're just providing videos for the highest % of our portable audience which requires us to set them to 320x240 resolution, but as Touches and iPhones become more popular we may look into adding another downloadable option a ways in the future.
There is mediacoder (what we use) and there is "MediaCoder iPhone/iPod Touch Edition." Both are available from the earlier link I put up. The MediaCoder iPhone/iPod Touch Edition is better for specifically that device, as it converts to the settings that are preferred by the iPhone/iPod Touch (higher resolution than 5th-gen ipods).