[Nook Touch General] Edgur:
I ran a complete nmap against the Nook on both TCP and UDP while it was connected to my WiFi. No open ports found.

The USB startup looks more promising, though --

Dec 13 21:19:33 MyLinuxBox kernel: [ 741.701292] usb 5-1: new high-speed USB device number 5 using xhci_hcd
Dec 13 21:19:33 MyLinuxBox kernel: [ 741.719705] usb 5-1: unable to get BOS descriptor
Dec 13 21:19:33 MyLinuxBox kernel: [ 741.722625] usb 5-1: New USB device found, idVendor=0451, idProduct=d00e
Dec 13 21:19:33 MyLinuxBox kernel: [ 741.722634] usb 5-1: New USB device strings: Mfr=33, Product=37, SerialNumber=0
Dec 13 21:19:33 MyLinuxBox kernel: [ 741.722639] usb 5-1: Product: OMAP3630
Dec 13 21:19:33 MyLinuxBox kernel: [ 741.722643] usb 5-1: Manufacturer: Texas Instruments
Dec 13 21:19:33 MyLinuxBox mtp-probe: checking bus 5, device 5: "/sys/devices/pci0000:00/0000:00:10.0/usb5/5-1"
Dec 13 21:19:33 MyLinuxBox mtp-probe: bus: 5, device: 5 was not an MTP device
Dec 13 21:19:36 MyLinuxBox kernel: [ 744.721151] usb 5-1: USB disconnect, device number 5
Dec 13 21:19:48 MyLinuxBox kernel: [ 757.351633] usb 5-1: new high-speed USB device number 6 using xhci_hcd
Dec 13 21:19:48 MyLinuxBox kernel: [ 757.371138] usb 5-1: New USB device found, idVendor=2080, idProduct=0007
Dec 13 21:19:48 MyLinuxBox kernel: [ 757.371146] usb 5-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
Dec 13 21:19:48 MyLinuxBox kernel: [ 757.371152] usb 5-1: Product: NOOK GlowLight
Dec 13 21:19:48 MyLinuxBox kernel: [ 757.371156] usb 5-1: Manufacturer: B&N
Dec 13 21:19:48 MyLinuxBox kernel: [ 757.371160] usb 5-1: SerialNumber: 303xxxxxxxxxxxxx
Dec 13 21:19:48 MyLinuxBox kernel: [ 757.378672] scsi6 : usb-storage 5-1:1.0
Dec 13 21:19:48 MyLinuxBox mtp-probe: checking bus 5, device 6: "/sys/devices/pci0000:00/0000:00:10.0/usb5/5-1"
Dec 13 21:19:48 MyLinuxBox mtp-probe: bus: 5, device: 6 was not an MTP device
Dec 13 21:19:49 MyLinuxBox kernel: [ 758.378396] scsi 6:0:0:0: Direct-Access B&N NOOK GlowLight 0100 PQ: 0 ANSI: 2
Dec 13 21:19:49 MyLinuxBox kernel: [ 758.378613] scsi 6:0:0:1: Direct-Access B&N NOOK GlowLight 0100 PQ: 0 ANSI: 2
Dec 13 21:19:49 MyLinuxBox kernel: [ 758.379838] sd 6:0:0:0: Attached scsi generic sg2 type 0
Dec 13 21:19:49 MyLinuxBox kernel: [ 758.380186] sd 6:0:0:1: Attached scsi generic sg3 type 0
Dec 13 21:19:49 MyLinuxBox kernel: [ 758.390847] sd 6:0:0:1: [sdc] Attached SCSI removable disk
Dec 13 21:19:49 MyLinuxBox kernel: [ 758.392285] sd 6:0:0:0: [sdb] Attached SCSI removable disk
Dec 13 21:20:06 MyLinuxBox kernel: [ 774.892800] sd 6:0:0:0: [sdb] 1040352 512-byte logical blocks: (532 MB/507 MiB)
Dec 13 21:20:06 MyLinuxBox kernel: [ 774.893133] sd 6:0:0:0: [sdb] No Caching mode page found
Dec 13 21:20:06 MyLinuxBox kernel: [ 774.893143] sd 6:0:0:0: [sdb] Assuming drive cache: write through
Dec 13 21:20:06 MyLinuxBox kernel: [ 774.894122] sd 6:0:0:0: [sdb] No Caching mode page found
Dec 13 21:20:06 MyLinuxBox kernel: [ 774.894129] sd 6:0:0:0: [sdb] Assuming drive cache: write through
Dec 13 21:20:06 MyLinuxBox kernel: [ 774.895708] sdb:

As you can see, when the NGL first powers on, it presents itself as VID 0451, PID d00e for three seconds.

This seems like good news! Some sort of TI OMAP boot mode?