Doom port exists for the Spectrum too....essentially 1bit graphics though :eek:
The A8 port of Wolf is not really finished, there is no allowance for game code, and I believe it is using some weird 80x80 pixel screen mode. Looks good though, hope they have enough CPU time to make it into a game and it isn't another let down like the Shadow of the Beast rolling demo coded for the 128k Amstrad 8bit computers which can never be used for a game.
Yes, there's even a Doom port for the Spectrum, I haven't tryed it yet. The Atari port of Wolfestein is just a proof of concept (for now), but it really looks good.
That's what I love most about the 8-bit scene, people are trying to get the most out of the available hardware. There are also some very cool demo's for the zx81 (my first computer), like this one
http://www.youtube.com/watch?v=gpsvgWsTX1I&feature=related.
That's something you don't see very often for a stock Amiga 500 nowadays.