Native Instruments' Guitar Rig has a "talk wah" module that sounds like a talk box. The Guitar Rig package also allows a whole bunch of creative distortion (and comes with a USB foot controller for sweeping the talk wah).
Audio Ease released the Nautilus Bundle (well, either that or the Rocket Bundle. It's been a few years since I made music at my old Mac.) which had a "vocal filter" effect called Roger. Pretty cool.
The latest version of Prosoniq's Orange Vocoder adds the ability to string vowel and consonant sounds together, for an odd "vocal-type" sound. It's not talk-boxy, though, just vocalish.
The wise man knows that he knows nothing.