Hi Kevin, thanks for the detailed screenshots. I'll assign this bug to the Thai team to have a look at.

The ones I could identify as untranslated:

* gbrainy: can be translated here: https://translations.launchpad.net/ubuntu/lucid/+source/gbrainy/+pots/gbrainy/th/137/+translate, I'm not sure if it needs translation, though

* Mahjongg: can be translated here: https://translations.launchpad.net/ubuntu/lucid/+source/gnome-games/+pots/gnome-games/th/1579/+translate, I'm not sure if it needs translation, though

* Mines: already translated the same as English -> https://translations.launchpad.net/ubuntu/lucid/+source/gnome-games/+pots/gnome-games/th/1261/+translate

* Quadrapassel: already translated the same as English -> https://translations.launchpad.net/ubuntu/lucid/+source/gnome-games/+pots/gnome-games/th/1068/+translate

* OpenOffice.org Drawing, Presentation, Spreadsheet, Word Processor: I'll have to look into those, but I'm afraid that for now translations cannot be included in Ubuntu unless they are translated upstream. See bug 512395 for more info. Should be translated upstream for now, or patch the Ubuntu package with the translations. If I can help with that, please let me know.

* Simple Scan: can be translated here -> https://translations.launchpad.net/ubuntu/lucid/+source/simple-scan/+pots/simple-scan/th/29/+translate

* Firefox Web Browser: similar to the OpenOffice.org case. Should be translated upstream for now, or patch the Ubuntu package with the translations. If I can help with that, please let me know. See bug 512380 and bug 543590

* Terminal Server Client: can be translated here -> https://translations.launchpad.net/ubuntu/lucid/+source/tsclient/+pots/tsclient/th/2/+translate

* VirtualBox OSE: this is neither installed in Ubuntu by default, nor is it in the main repositories. This means that it is not translatable in Ubuntu and must be translated directly upstream:

* Tomboy Notes: translated here -> https://translations.launchpad.net/ubuntu/lucid/+source/tomboy/+pots/tomboy/th/4/+translate, not sure if the Packaged translation would be more appropriate.

* Pitivi Video Editor: can be translated here -> https://translations.launchpad.net/ubuntu/lucid/+source/pitivi/+pots/pitivi/th/2/+translate

* Computer Janitor: translated the same as English -> https://translations.launchpad.net/ubuntu/lucid/+source/computer-janitor/+pots/computerjanitor/th/33/+translate, not sure if it's the most appropriate translation, (and pending resolution of bug 522154)

* Hardware Drivers: can be translated here -> https://translations.launchpad.net/ubuntu/lucid/+source/jockey/+pots/jockey/th/20/+translate

* Login Screen: can be translated here -> https://translations.launchpad.net/ubuntu/lucid/+source/gdm/+pots/gdm/th/103/+translate

* Startup Disk Creator: can be translated here -> https://translations.launchpad.net/ubuntu/lucid/+source/usb-creator/+pots/usbcreator/th/68/+translate

* Broadcast Preferences: can be translated here -> https://translations.launchpad.net/ubuntu/lucid/+source/gwibber/+pots/gwibber/th/7/+translate

* IBus Preferences: can be translated here -> https://translations.launchpad.net/ubuntu/lucid/+source/ibus/+pots/ibus/th/33/+translate

* Monitors: can be translated here -> https://translations.launchpad.net/ubuntu/lucid/+source/gnome-control-center/+pots/gnome-control-center-2.0/th/478/+translate

* Network Connections: can be translated here -> https://translations.launchpad.net/ubuntu/lucid/+source/network-manager-applet/+pots/nm-applet/th/14/+translate

* Ubuntu One: brand name, not translatable