djac, some people want to have more space.
I'm one of those people.
For me it means not having to swap over files from my pc to flashcart. I prefer to just add files to the cart, it eventually fills but with more space that takes longer.
I think the DS-X looks great but the space is a limiting factor for me. I am glad that it is much easier to transfer files with DS-X (no game manager software!) but it is still a hassle when out and about with a portable.
I don't think it really needs to be argued over though. Some people are happy with 512 MB and some aren't.
I will be getting a DS-X in due course but am waiting for a hopefully 1 GB (8Gb) version. If it doesn't come out anytime soon I'll pick up a 512 MB to add to the cart collection.
Some people have a strong interest in having the DS as a media player too. It might seem crazy to you not to buy a dedicated media playing portable but for others it is not what they want.
I have a PSP for watching video on the go but like to use my DS for music sometimes as I don't take the PSP out much. Space is again an issue when trying to keep a bunch of games and music on the one cart.
To sum it all up: Some people want something that you and others don't. It's cool we can still all get along
Hope your DS-X turns up soon and it's big enough for you, in my experience once you have a flashcart for a while that's when it's no longer big enough. That's when you ask santa for another flashcart.
I want three this year santy, I've been good!