unionfs in livecd?

[Erik Udo]

I was thinking of making a personal livecd for my own use.

So, how is unionfs? I heard it's still buggy especially if you mount 
multiple memory devices.

I found a link to a patch from the freesbie-projects website that 
somehow patches the current.
http://people.freebsd.org/%7Edaichi/unionfs/
Should i use this?

Can i mount one singe memory device on top of the root-directory? I'd 
want my whole system writeable.

If not, then can aynone please tell me how i can have a stable, 
writeable livecd.

I'm thinking of using FreeBSD 6.2

Thanks,
Erik