With version 0.8.0:

1. Node got a lot faster.
2. Node got more stable.
3. You can do stuff with file descriptors again.
4. The cluster module is much more awesome.
5. The domain module was added.
6. The repl is better.
7. The build system changed from waf to gyp.
8. Some other stuff changed, too.
9. Scroll to the bottom for the links to install it.

下面是主要API的改动 https://github.com/joyent/node/wiki/API-changes-between-v0.6-and-v0.8