Cisco is the biggest networking hardware provider, regionally, and Nortel has also done a lot of work over there. They built “the great firewall of China” and considering that Burma is China’s little buddy it stands to reason that they’re involved there as well.

In terms of external sites, Yahoo, MSN, and Google (to name the big three) all have policies of cooperating with the local authorities in whatever legal framework they have going, including to track down individual users of their services (e.g. people posting “undesirable” things on the internet). This has been true in China, but also Singapore and a few other countries.