Do I need a FAT SD card? Do I need OM? Do I need... ? Choices, Choices, Choices...

[lists at kitepilot.com]

Can I just ext3 the SD card ?
I'm not very fond of FAT... 

Also, as of:
http://wiki.openmoko.org/wiki/Booting_from_SD
It says:
"WARNING: Booting from SDHC may cause problems at this time (see below)." 

Should I even try to boot from the SD card?
Are there outstanding issues that I should know of? 

How small of a card is too small?
Will 2GB be usable/enough or should I plan on something bigger/smaller? 

Finally, should I "Om 2009" or "SHR" ? 

Thanks!
ET 

PS: This flashing thing ain't easy...
For dumb people like me anyway...   :(