Path to Installous downloads:

    /private/var/mobile/Documents/Installous/Downloads

Multiple Exchange accounts:

    scp root@iphone.local:/private/var/mobile/Library/Preferences/com.apple.accountsettings.plist .

Ringtone conversion using ffmpeg:

    ffmpeg -i foo.mp3 -ac 1 -ab 128000 -f mp4 -acodec libfaac -y target.m4r