MMOs and Voice Chat

I know I said I was going to post yesterday, but I forgot about Labor Day. I ended up spending a lot of yesterday playing Dungeons & Dragons Online. Perhaps I'll do a review of that since they've changed their setup. Due to my bit of MMOing, I've been looking at live chat software. I know my husband and his group use Ventrilo but there has to be other options out there, right? Anyone else using voice chat stuff?