Its not advisable to switch to Ext4 until at least kernel 2.6.30, which is not out yet.

http://www.h-online.com/open/Kernel-Log-What-s-coming-in-2-6... (Read 'Data Security' section)

Erm, I'm pretty sure 99% of the people hear can figure this stuff out for themselves. Run of the mill Ubuntu tutorials definitely do not belong here.

What I don't like about the average Linux tutorial is that they hardly ever explain anything. They are all "go to file /ehh/dsf/dsfjlfdsjjk.grbl and edit the line saying 'fkfjfhjg%%&' to say '%%%fjj887744', then reboot the system and your sound card will work". I guess it is better than nothing, but ultimately it feels a bit like wasted time. If it is complicated to make something work, at least I want to learn something while making it work.

Also, a lot of these cryptic tutorials seem to be outdated, because modern distributions offer easier ways to do the same thing.