Aside from the opensource VoxPop voices that are available from the VoxATC web site, are there any other opensource solutions for additional voices that are available? I've Googled till my fingers ache and have not found a thing.

I don't know about anymore opensource voices but why not try the Ivona voices via use of there demos. Lasts a while and i think you can use two voices. Nice quality but a shame they don't have a static radio effect.

Pricey but nice.

I used the text box and was quite impressed with the quality.... and then I looked at the price. Well, you get what you pay for. I guess I'll be sticking with free.