Quiet Art has released a Windows version of Wave Rider in RTAS and AAX formats. The latest version is 2.1.16 and is compatible with Windows XP, Vista, and Win7. The latest Mac version is 2.1.15.
Wave Rider is an automatic volume riding plug-in with functions like consistent level, ducking, gating, and tracing.
A demo version is available at automaticmixing.com
An AAX version for Mac is due soon.