You guys need to calm down a little. Here's how i understand this whole situation. Before China took over Tibet in 50s, Tibet used to pay Nepal yearly tax after they lost war with us. China was going through the "Cultural Revolution" back then. For them Tibet (a region governed by religious sects (theocracy)), was troubling and some how threatening to their revolution.
Now regarding Nepalese cooperation to China - it is a very basic principle of nature 'big fish eat small fish'. You know the saying "if you can't beat them join them". We cannot oppose to China and India in certain  issues. We  are torn between two nuclear power 2.5 billion people's nations. So I hope our Tibetan friends understand this. Unfortunately, these are the only two countries that can help us in many disastrous situation, and for that matter we cannot loose them.
Western nations can brag and criticize for Nepal's role in Tibetan protest, but ask yourself, what have they done. Bush has said nothing so far regarding Tibetan situation. There are no foreign media present in Tibet. Who knows how many Tibetans have been killed, yet not a word from Bush. Isn't US the biggest allie of free Tibet movement? How come there is such a level of silence then...I know why. Things have changed between US and China. China is the biggest trade partner for US and for India as well. That's why both India and US don't want to upset their trade buddy.
I  personally don't like the excessive force used by Nepalese police to Tibetan protesters. I thought they could have handle it better than that.
Someone said 'what would they do if they got freed from China'. I thought that was inappropriate. You are valuing freedom against materialism. Just remember, some prefer death on feet over life on knees.
Thanks,
SS