Hey Koki:
The original logos are in the repository: http://svn.berlios.de/viewcvs/haiku/haiku/trunk/data/artwork/ The files are available in PNG and WonderBrush format. I am not sure if WB can export to AI format, but I am almost certain that SVG is supported as an export file format, so this could be an alternative if you need vector files.
Thanks for the link! Could someone please convert this logo to the SVG format for me? I will be working in Mac OS X and do not have a copy of WonderBrush. Thanks! Mike