The W3C CSS Working Group has posted the last call working draft of Cascading Style Sheets (CSS) Snapshot 2007
When the first CSS specification was published, all of CSS was contained in one document that defined CSS Level 1. CSS Level 2 was defined also by a single, multi-chapter document. However for CSS beyond Level 2, the CSS Working Group chose to adopt a modular approach, where each module defines a part of CSS, rather than to define a single monolithic specification. This breaks the specification into more manageable chunks and allows more immediate, incremental improvement to CSS.
Since different CSS modules are at different levels of stability, the CSS Working Group has chosen to publish this profile to define the current scope and state of Cascading Style Sheets as of late 2007. This profile includes only specifications that we consider stable and for which we have enough implementation experience that we are sure of that stability.
Note that this is not intended to be a CSS Desktop Browser Profile: inclusion in this profile is based on feature stability only and not on expected use or Web browser adoption. This profile defines CSS in its most complete form.
Note also that although we don't anticipate significant changes to the specifications that form this snapshot, their inclusion does are not mean they are frozen. The Working Group will continue to address problems as they are found in these specs. Implementers should monitor www-style and/or the CSS Working Group Blog for any resulting changes, corrections, or clarifications.
There actually isn't that much that's ready; mostly CSS Level 2 plus CSS Namespaces, Selectors Level 3 and CSS Color Level 3.