MednafenX-Lynx, MednafenX-NES, MednafenX-PCE v1

Xport released 3 new emulator for the Xbox ported from mednafen.com:

MednafenX-Lynx: Emulates Atari Lynx
MednafenX-NES: Emulates NES/Famicom Disk System/VS UniSystem
MednafenX-PCE: Emulates PC-Engine/TurboGrafx-16/SuperGrafx/Arcade Card CD/CD/SCD

Features:
*(ALL) Excellent (for PCE also stupendous, fanshmabulous) compatibility - ported from Mednafen
*(ALL) ZIP support
*(PCE) Launch original PCEngine CDs from your XBox DVDROM drive
*(ALL) Loads of hardware/software filters and video options to tweak
*(ALL) Cheat system - Search/Create your own cheat codes (see notes)
*(ALL) Favorites list
*(ALL) Save states
*(NES) Light gun support (see notes)
*(ALL) Fast forward/throttle
*(ALL) Resizable game screen
*(ALL) Text file viewer
*(ALL) ISO9660, Relax, Samba support
*(ALL) Take in-game screenshots and display them on the game selection list
*(ALL) Record/Playback feature - record your gameplay in the emu and then play it back again. Record up to 10 minutes of gameplay.
*(ALL) Every single in-game command is fully customizable on any of the four joypad controllers.
*(ALL) Map any emulator or UI command to a single button or a combination of two buttons. (e.g. RTrigger+LTrigger = Save State)
*(ALL) Autofire capabilities for any emulator button on any controller
*(ALL) One-button combos (define a series of emulator commands to be played back when you press a user-definable XBox controller combination.) (E.g. Press RTrigger+LTrigger to execute the command string A,B,A,B,Up,Down,Left,Right)
*(ALL) Traverse any directory on any drive ( Continue selecting the parent directory entry on the file selection list to get the drive selection list. Selectable drives are C, D, E, F, R, X, Y, Z, RLX, and SMB. R is the CDROM drive. SMB is your samba share, RLX is your relax share. Press Y from any file-listing screen to go up one directory level.
*(ALL) All UI commands (save state, load state, screenshot, etc) can be invoked from the Options/Pause menu as well as in-game via your customized joypad mappings.
*(ALL) All the other standard features found in XPort ports.

More info --> http://xport.xbox-scene.com