Creating a fullscreen window doesn't appear to be working correctly. Here's the test program I'm using (error-checking has been removed for brevity):

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#include "SDL.h"

int main(int, char*[])
{
    SDL_Init(SDL_INIT_EVERYTHING);
    SDL_Window* window = SDL_CreateWindow(
        "", 0, 0, 1280, 1024, SDL_WINDOW_FULLSCREEN | SDL_WINDOW_SHOWN);

    bool quit = false;
    while (!quit) {
        SDL_Event event;
        while (SDL_PollEvent(&event)) {
            if (event.type == SDL_KEYDOWN || event.type == SDL_QUIT) {
                quit = true;
            }
        }
    }

    SDL_DestroyWindow(window);
    SDL_Quit();

    return 0;
}

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Everything succeeds and the window is created, but not at fullscreen; the taskbar and menu bar are still visible, and clicking on the window's title bar causes the window to minimize.

This is with Ubuntu 10.10. (It looks like there are some related bugs in the database, but I'm not sure if they're exactly the same.)

Let me know if you need any other info.