Personally I wouldn't mind seeing the following as a part of SX.
1. A Sega release list, for example, have every game released for the genesis, saturn, dc in north america and different countries, including if the game is ntsc, pal, jap, eur etc.
2. Some sort of contests, getting everyone in the spirit to do something for the site, get everyone involved. Nothing too hard, and nothing too easy.
3. Remixed music sent in by visitors of the site, including in the info what program they used to compile the song, how long it took, etc etc.
4. A few more options in the "Other" Section of the message board, for instance adding an "Xbox" forum for users of the xbox to discuss various issues in. Sega releases on that system, so it makes a little sense.
These are just a few of the suggestiosn that I have for the site. If i've copied anyone here, I apologize as I just skimmed though the thread and decided to post.
-Ratamahatta