After using Ubuntu Intrepid Ibex on a CF card for some month I finally dropped Xandros and installed Intrepid Ibex on the SSD instead. I did not have any SIGSEGVs since then, so I'm pretty sure that it was a Xandros software bug.
2008-12: The mysterious 30 sec boot delay has gone after updating the BIOS from version 0403 with BIOS-Date: 08/04/2008 to version 0607 with release date 09/24/2008.So for me this update saves 30 secs.
ASUS does not give any changelog information.
I used the tools found at http://downloads.k0k0.de/index.php