The N1's board design is pretty clean (Figure 3) and is centered around an Intel IXP420 network processor and ICplus IC175 5 port 10/100 switch. There not much else to it besides power supply components, 32 MB of Nanya RAM and 4 MB of Macronix flash.
Figure 3: N1 Main board (click image to enlarge)
The radio (Figure 4) is a connectorized mini-PCI module based on Airgo's xspaN MIMO AR5008 chipset, consisting of AR5416 Baseband / MAC and AR2133 (3 Tx, 3 Rx, single-band 2.4 GHz) radio chips.
Figure 4: N1 radio board (click image to enlarge)
The same chips are used in the N1 Notebook Card (Figure 5). It's a bit hard to see from the photo, but two of the three notebook card antennas are bent-metal elements raised about 3/8" off the board surface.