kinkinkijkin I listed modern systems because it is what I know. I don't know anything about homebrew roms, carts, assembly language or distribution so I didn't mention them. 'Retro nerds' would be interested in a game with a retro style on a modern console as well as on a cartridge. There is room for both.
[edit] I think people listen to the music because it sounds good. Not because they are impressed by what the artist could do within the limits of the system. So then what does it matter whether its 8 or 32 bit? Its all about style and quality.
As to the above poster, that's why I'm using Famitracker! Although I aggree with Vonzippenstein to an extent, I think you are making it very difficult for yourself if you intend to use only this program in a proffesional context. I use it peppered throughout tracks and it's brilliant for adding a bit of character (I love what it does to samples) and for jamming out ideas. I'll post some stuff up soon!
Easy, go to game company sites and send them an e-mail about it. Again, I would like to point out that I highly doubt they would accept 8-bit music for their game. You may end up having to use Sonar or CuBase which is what most vgm composers use for their game music these days. If you want to use a tracker, I believe they would be okay with Renoise. Sometimes, they will set you up with music software of their own and it's up to you to find out how to use it. You may get help with it but not very much.
If you are that desperate to use Famitracker for game music, ask around for people who are making NES games and they may hire you. Look at me, my friend's making an NES game and I'm using FT to make it's music and sound effects. I'm only human. If I can do it, you can do it.
Definitely good in my case. I go to write a song for the land of reapers, and because of how badly I mess up I need to tell everyone that the land of reapers is going to be a happy place.