Problems handling special characters in Air Video
I had problems with handling nordic character (æ-ø-å) correct in my Air Video server, but I find a simple fix for it.
Under Air Video Server Click on Options / preferences, go to Subtitles. Change "Default Encoding" to Western (ISO Latin 1; ISO 8859-1).
Access a Apple Tv via FTP
If you will install XBMC, Boxee or do something else on your Apple Tv, you need a way to access your ATV. This article will show you how easy you can access a Apple Tv through a ftp client.
1. Download Cyberduck. It's a Open source FTP client. http://cyberduck.ch/
2. Unzip and install Cyberduck on Mac or Windows.
3. Open Cyberduck and click on "Open connection"

4. Select SFTP (SSH File Transfer Protocol)
5. Under Server, use your Apple tv's IP adress. Something like "192.168.1.100"
6. Default Username is root
7. Default Password is alpine
Now you are connected.
Apple TV 2 NAS Streaming with XBMC using Samba
SSHing or use FTP to manually editing the sources.xml file, located at this path:
/var/mobile/Library/Preferences/XBMC/userdata/sources.xml
Add a new samba source like this:
<source>
<name>MyShareName</name>
<path pathversion="1">smb://username:password@server.com/share/video/</path>
</source>
Restart XBMC.