Node.js v0.9.0 (Unstable) is out

Considering the current numbering scheme, 0.9 will be the unstable version of 1.0. Which means 0.9 should give us a very good idea of the final backwards compatible API (hopefully)

Streams are everywhere, as an abstraction of async I/O model. Hope the Stream API will have a cleanup by 1.0.

Might be smart to mention in the title that its just an unstable release.

Nothing jumps out at me as significant to bump the version to 0.9. Can someone explain what makes certain changes worthy of the version change?

I haven't even finalized migrating from 0.4 to 0.8...