ASusEee is a series of little and handy notebooks. I have one, 900-linux model actually, and I made install PCBSD on external drive -WD Passport 80. On this page I'll explain how I did this, and what struggles I had, and what workarounds I found out.

1. Booting from SD card.
   

Well, plain and simple. got ISO, extract to SD card; when powering Eee pressing Esc - boot menu appears, chose SD card. No boot. Placed freebsd boot loader to SD - also no boot. Okay, I have Linux version of Eee, so I have GRUB, yes? For show grub menu we need a little trick - press Esc at start, chose our 1st Hard drive. After that we have countdown from 9,8..1 till boot. We can wait, and can press Esc again for boot. But I suggest pressing F9 fast, and simultinously Esc - if success then we are in Grub. Phew.
Press "c" for grub command prompt. this prompt have tab-complition, like bash; typing:
root (hd2,0) --- hd2 in my case, if you have connected more devices, then you'll need to know what disk is correct one.
kernel /boot/loader --- bsd loader
boot
and here we go! but, not far :(
bsd loader can't find kernel.

We have here to enter two more command:
set currdev=disk2s1 (actually I think loader could guessed itself, but due to some bug, or incompatibility with grub, this var is set to disk2s1' - yes, with quote, I don't know why)
include /boot/loader.rc --- yes, we have well-known boot menu! starting normal mode, and... crushed, as we booted are not from CD.

2. Patching files for USB boot.

3. Installing manually

4. Patch files for correct install.

5. Tweaking pcbsd for normal work.

6. Final Post "we have now usb-PCBSD bootable version"

soon I hope :)