F1ach: They are part of the games bonus content :)
jefequeso: I was actually a little disappointed with the avatars and wallpapers. Then again, I'd rather have SS2 sooner than have them spend time on more creative extras.
Yeah, 2 avatars isnt great, I had a quick look and although theres a fair bit of stuff, none of it (to me) is great, but thats like looking a gift horse in the mouth.
I had the original with the gfx enhancements mod, so the release for me is no biggie, but the fact that GOG were able to unearth it and sort out the legalities....PRICELESS :)