[XeTeX] Multicolumn Table of Contents

[E Ochsenmeier 4 senses]

I am trying to do a multicolumn TOC which does not start on a new page  
and is evenly balanced, like the one at the beginning of the  
biblatex.pdf of bidi.pdf.

I can have a TOC in the column if I use the article class. If I use  
the memoir class it goes back to a new page, one column TOC.

I looked at the code of the biblatex.tex and the menman.pdf but can't  
figure out for the life of me how to reproduce a nicely balanced TOC.  
Any hint is welcome.

E. Ochsenmeier