Ha Ha Ha, You ready want to brick it? I can help u

Added on May 1, 2010, 12:03 amHow the speed of class 4 16GB? I am intend to buy but scared it slow, I can't get any 16GB class 6. (Never though about class 10 cause class 6 I also can't get)
Added on May 1, 2010, 12:10 amWelcome to the Android world.
I suggest you play it for at least a week, read read here here and there there before starting it.
Current stable ROM: Cyanogen 5.0.6-N1 (before installing this, you need to install RA-Recovery 1st, so go read read 1st most famous forum is important, and be patient and read carefully if flashing Radio-not neccessary, as only flashing radio can brick the phone if not doing it correctly.)
If using Cyanogen, I suggest you use the Apps2SD, with it you can install plenty of Apps, without it, sorry la.... You need to create SD-Ext for Apps2SD which means it will clean up-formatted your SDcard.
For contact, as long as you sync with Google, it shall be ok, it will re-sync back after you rooting, install the new ROM and connect.
Others will lose when rooting the phone as it wll reformat to factory default.
All the best, and have fun

Thanks for the pro reply.
I have read some review on rooting the N1. They suggest to install Nandriod to back up - is this neccesary ? Whats the use of this ?
Another question, when i dl those 3 major files... where should i install it at? in the phone ?