Ok with the recent silent DAE changes and stuff its becoming frustrating keeping up with stuff. Im wondering the best way to have 2 xboxs, 1 for online 1 for offline, and still keep the same gamertag with the acheivements. I enjoy getting them and like them to update on my gamertag. Let me know, thanks.

you could get a flash drive to store your account on

I mean maybe a flashdrive would work kinda. How would I go about doing that? Would I format the FD for the xbox and then switch back and forth? Will that keep the acheivements i get in the offline games?

If you store your profile on the flash drive, yes it will save your gamerscore.

I simply have a 360 memory card with my profile on and just switch between the JTAG and online 'box as required...

What happens if your memory card or an usb flash drive fails?
I think u need to move ur profile to other device and cannot just copy it
This means to be safe move it to USB stick and then make backup of it on your computer ... right?

I prefer to use my 360 HDD on both - is this no longer possible now?