for those of you that have a modchip that you disable, you can get the modified dashboard to run it's settings from a different folder on the C partition, but i couldn't get it running on the E partition.
after following my tutorial and confirming that it works fully, i grabbed a clean xboxdash.xbe from a backup i have.
i resigned using winXIP, then used ultraedit (or any other hexeditor) and opened the xboxdash.xbe. using the search function i searched for 'partition2'. pressing F3 to search for the next instance, you get the xboxdashdata.xxxxxxx after it. i simply changed xboxdashdata to xboxdashdatb (something i saw Nailed do on another forum).
Save the xbe, and upload. Make a new folder on C, should be called 'xboxdashdatb.1012a700' or something like that...put all the *MODIFIED* xips in this folder. go to the 'xboxdashdata.1012a700', and upload mainmenu5.xip, settings3.xip and default.xip from your backup of C. These 3 xips are unmodified and untouched obviously.
If you use an X2 bios, this is what i did to get evox and the ms dash working together.
renamed evoxdash.xbe on the C drive to 'eevoxdash.xbe'. transferred the xboxdash.xbe that we just hexedited and called it 'evoxdash.xbe'. you'll have to make sure that teh whitedown function in default.xap of default.xip does call 'eevoxdash.xbe' (evolution x) and not 'evoxdash.xbe' (otherwise you'll end up calling the same modified MS dashboard and will need an evox CD to boot to fix your mistake).
now if you have a modchip and turn it off to load the original kernal, you'll get the untouched MS dashboard, and you are free to edit xbox live accounts, memory, or whatever you want. in the future, i'm not sure if MS will send updates through xboxlive to 'search and destroy'. if they eventually do, we'll have to get the custom dash running on the F partition, as that partition doesn't exist according to the original kernal (or so i think).
hope that helps for people who have the xbox live dash, and actually have xbox live and don't want to mess up anything because they need to access xbox live functions (i have no idea how xbox live works cos it's not out in australia yet)....