Not sure where to post this, but here it is (not mine)…
have a look at this http://flashdaily.net/post/63359150472/crt-effect-on-stage3d-with-source-code. Nice uh?! And it runs at a steady 58-60 FPS!
Although it may seem more Flixel-related, the code underneath makes use of Stage3D (and yeah… if you’ve not already guessed it… shaders) making it “AS3 Engine-agnostic” (but for Flash 11+ only).
Anyone interested in having it ported to FlashPunk (and maybe making it more generic/adaptable)?
As a side note, I just found out that the the Flixel community has gained new life with the combined efforts of old users and the great guy managing the awesome AS3GameGears site. Mmmmhh… Time to see what we can steal borrow from their updated codebase ;).
EDIT: A better looking effect using AGAL here (no code unfortunately)