Spanning MP3 files over multiple Audio CDs

Hi all,

I write and sell educational audio courses and need advice for a variety of projects I am working on. My first question is how to make a set of masters quickly and as automated as possible. I have a set of over 400 MP3 lessons, each of different lengths and need them burnt to audio CDs. I could manually make each disk in Nero but that will takes ages. Is there a tool or program that will import and span audio over x number of disks?

I will have need of this tool many times in the future so it is well worth my time getting it right.

Thanks in advance