DFX for Winamp 5
It seems DFX for Winamp will still work, you just may have to re-install DFX. The only thing you may notice, or at least I did is DFX will not "snap" to Winamp as it did before, but you still get the beautiful sound.
By the way, I would love to have this functionality built into Winamp in the future, the ability to enhance the sound beyond the EQ. DFX really brings out the clarity and bass.
Just my input.