Thx a lot for this tuturial !
I installed Mango on a alix 3d3 and it works perfect. At first i had problem to get the Java package, finally i got it using "apt-get install openjdk-6-jdk".
To start mango automatically i added the following lines to /etc/rc.local :
cd /usr/local/apache/bin
./startup.sh
Thats all. For a long time i was searching for a small datalogger, now i have one ! Great !