You can find some quick download links below or you can pull the artifacts from the maven central repository.
Weld is used in GlassFish V3 and the upcoming JBoss AS EE 6 Preview release release (watch Jason's blog for more!). We also have support for Servlet containers such as Tomcat and Jetty. JSF support is built in, but with Weld you could use Wicket as your view layer, and Swing, or even JavaFX is supported via the Java SE support. If you are an OSGi fan, there's a bundle.
If you are just getting started, there are a few examples in the distribution to guide you (look for instructions in the reference guide, and each example has a readme.txt). If you are looking for help, try our forums, or perhaps join us on IRC.
I intend to do regular releases of Weld from now on (around 8-10 weeks apart), and for 1.0.1 we'll be concentrating on running an indepth performance and scalability analysis (as well as fixing those bugs you report!). Those of you who follow us closely will know that we've been concentrating on Weld/JSR-299 recently, but with 1.0.0 out, you can expect to see our attention swing back to Seam 3 - so watch this space, as soon as we have nightly builds to try out, I'll post instructions :-)
One omission from the CR1 release was the reference documentation -- since then a lot of effort has been put into the reference guide and the JavaDoc for the CDI API - make sure you check it out!