Win2DS is a program that will give you remote access to your Windows PC through your DS. It will let you send virtual keystrokes and mouse input over a wireless connection and show you full and zoomed screenshots of your desktop.
How to use:
I'm not sure how well this works on NeoFlash hardware, because it's kind of screwy, but it works great over WMB, and probably directly off a flashcart. I tried NeoMenu 0.6 and it works well burned as the menu
Don't forget to run the server first and consult the Manual.htm in the manual\ directory for full instructions.