Today, the After Effects 9.0.2 update was released.

If Adobe Update Manager hasn't already told you about this, go ahead and check for new updates for After Effects CS4. (Choose Help > Updates.)

There are a lot of fixes and tweaks in this update, including some significant upgrades in RED (R3D) support.

I've got details on my blog (http://blogs.adobe.com/toddkopriva/2009/05/after_effects_902_update_red_r.html).

The whole CS 4.1 update already has a discussion in progress here on DVINFO:
http://www.dvinfo.net/conf/cineform-software-showcase/236320-new-adobe-updates-available-premiere-4-1-after-effects-ame.html