Being the odd person that I am, I've looked most of these up before. If you look in the VO credits of all your Interplay/Black Isle/Bioware manuals, you'll see all the same names.
And if you play the games over and over you'll start to pick out who does who's voices...I've started seriously playing Icewind Dale and can say "Oh, that's Jim Cummings." or "Oh,that's Kath Soucie." This is when you can proudly identify yourself as a nerd.
When I first played BGII, I had the Female Voice #4 for a bit and then it sounded painfully like Velma after a while. Then switched to #3-Too much like Lil. #2, the one that starts with the giggle and is whispery is the one I use now.
I've always wondered what Jim Cummings looked like, considering the huge amount of voicework he's done...thanks for the DVD reference.