DJ_Steve has now written a script, which is now in a usable state.
(I made a few edits to make it work though)

Please read the entire post before doing anything.

NOTES:

• This may kill your cat/dog/computer/N900, it's your responsibility!
• You must add extras-devel in your repository list, read more here: http://wiki.maemo.org/Extras-devel (Instructions at the bottom, read the warning on top first)
• You will also need to flash the kernel manually, read more here: http://wiki.nitdroid.com/index.php?t...stall#Flashing

Note about flashing, here's how to install flasher(on Windows):
Short instructions:
(Commands are quoted, you should not type the quotes however)

• Enable extras-devel
• Open App manager, install rootsh
• Open Xterm, type "root" then "cd /"
• Now type "apt-get install wget"
• Then type "wget http://downloads.nitdroid.com/autoinstaller/installer.sh"
• Then you need to type "chmod 777 installer.sh"
• At last, type "./installer.sh <size of FAT32 partition in MB>"
• Read warnings in terminal, and wait!
• Flash
• Reboot with keyboard slid out
• Choose the "Android" item
• (Hopefully) Enjoy NITDroid.

Now, if you're happy with NITDroid and want to aid development, please consider donating:

Please feel free to donate to my(DJ_Steve's) work - GBP Donate(£)/USD($) Donate

PS: this post is made on behalf of DJ_Steve
PS#2: Hope you aren't annoyed with the colored title text