Forgot:
You connect to phpmyadmin with root and no password.

Do you know mysql? You can do that from the console:

mysql
use pluto_main
then run the update command for  mediatype table
UPDATE MediaTYpe SET Extensions = 'you add the new list of extensions' where PK_MediaType = '5' (for video)

You can also do that a lot easier with phpmyadmin:
install the package first:
sudo apt-get install phpmyadmin
then you can access it by typing in a browser: coreip/phpmyadmin

You can run an apt-get update to fix the broken packages.

To configure your VOIP account with LinuxMCE, you need to go to 'Setup Wizard' (from the main menu, click on Advanced / Setup Wizard / House Setup / VOIP Provider. You will find your provider in the list. You have to enter your: - VOIP number, username and password obtained from your provider, then save the settings and reload the router.
You can find the Asterisk configuration page (AMP) by accessing the web admin (type your Core's IP in a browser), and go to Advanced / Configuration / Phones Setup. Here you can make changes to your provider's settings in the Trunk section, or setup different rules for calling in 'Inbound / Outbound routing'.

Hope this helps

For adding GC100 to LMCE, you have a specific button:
1. from the main menu, navigate to advanced/advanced/'Add GC100" or
2. In the web admin / Interfaces, 'Add GC100'
-Make sure you have reseted to its factory defaults before that

After you add it, you need to make sure you have set the proper baud rate in its configuration page ( you can access it by typing its IP in a browser from a computer in its internal network. (If you don't know the IP allocated for the GC100, you can find it in web admin / Interfaces, find GC100 in the list and go to 'Advanced'

Please read the blog's comments, too. I've already posted a how to there. 

I believe you can configure a new VOIP account (with a new provider's name) from the web admin / Advanced / Configuration / Phones Setup . I'm not very familiar with AMP, but I believe you have to go to trunks first and add one, then to Outbound/Inbound (to set preferences for local or international dialing. I have taken an account defined in the wizard as an example, and configured another one the same way.

Snom 200/320, BudgeTone

For X10, you can use CM11A as an interface.
In what concerns the multi-room audio system, for any media director you have in LinuxMce, there is an embedded phone device, so you won't need anything else than a headset and a microphone attached to each MD, and you will be able to join all your MD's in a conference throughout your house. If you want, you can also define a VOIP account (there's a step in the setup wizard) or you can do that from the web admin (Wizard/Devices/Phone lines).
If you want to use a physical phone, those I know that work are: Cisco, Snom 200/320, BudgeTone

Hope this helps

It' s the user(s) you have created when you run the setup Wizard (house setup), the password is the same with the user name, unless you changed it on purpose.
If you haven't got to run the setup wizard and accessed the web admin, first time you are prompted a message saying there are no users in the database and you need to create one, and there you give a username and a password.

You cannot choose what menus to appear. However, clicking on your mouse right button makes them not visible (until you press F7).

Take a look at this:
http://forum.linuxmce.com/index.php?topic=1232.0
maybe it helps

http://wiki.linuxmce.com/index.php/Installing_LinuxMCE_on_your_mobile_phone

http://forum.linuxmce.com/index.php?topic=1671.0

From the interface , main menu, advanced submenu, click on the "Infrared Codes" button.
You will see a list of devices that respond to IR codes. You have to select the device you want and click on advanced button (in the right side).
Then, in the right column you will see the list of available commands and the 'learn button'.
Click on "learn" for the command you want, and you will see the message: "Waiting for IR code". At that moment you have to point your remote at the IR receiver and press the corresponding command button on your remote.
You will see the message stating the command was learnt. Sometimes, it fails to learn it and you have to try again.

There is also another way to input IR commands, by copy-paste them in their specific format (if you find them listed anywhere like this). You can do that from the web admin page/ AV Equipment section, click on AV Properties for the device you want to control.