I wish they had specified what options were used, as there are several journalling options for the journalled fs used, and I am too lazy to go dig up the options for the os they used. I'd have like to have known if they used the ssd option for btrfs, also, I think Reiser4 (amazingly enough, people are still working on it) with it's wandering logs would have been a nice addition. UDF would be good too, for those of us who want out of the box portability.
I have a Class 10 SDHC card and it is slow as hell on Ubuntu 9.04 ext2.
Problems are cron jobs, the apt-database or access to its cache by Firefox 3.5. I've thought it would easily outperform my slow 1,8" hdd but I was wrong.