Alright, since everyone says im being shady on it, ill just post straight up. Please, do follow the rules on other sites.
First off, a site where you can often find out about new release and such is xbox-scene.com . It also has great forums, just do read the Stickies and abide by the rules, they dont take kindly to people posting in wrong sections and stuff.
Second, for a full release list, go to xbins.org . However, you cant download directly from there, but it serves as a good list.
Now to actually get the emulators, you need mIRC, which can be found at mirc.com . After you set up the basics, connect to the server EFNet. Anyone *should* do. Once connect, join the channel #xbins . Once here, it will tell you how to get to the Xbins FTP, along with the rules for it. It will have emulators, bios, dashboards, homebrew games. Of course, to connect to the FTP, you will need a program such as FlashFXP, or many others which are probably in another FAQ.
I hope this helps SOMEONE at least.
If something doesnt work, let me know, and ill answer and fix this. I wrote it in a hurry