You should probably know that huge textures like that may not work in older video cards. Sticking with a maximum of 1024x1024 (the suggested maximum for compatibility) is better. With multi-texturing, you can split that 2048x2048 texture in 4 1024x1024's and add more compatibility for older systems. Of course, it'll still take up the same amount of memory, but it's the greater compatibility that makes it more important. Just a suggestion though.