Okay, I may have a slight bit of more insight into this. Apparently the random 24.whatever IPs were indeed what google was picking me up as... ...even though the device was reporting its internal IP as 192 something. Whatever, I'm not an expert. (Though this is from both my home and another home. It picks me up as on another 24.randomnumbers ip, which is different from the previous one but no were close to the actual internal one.)
It seems like whenever I log in, the same IP connects twice. One is 'me' to the best of my understanding, and it's labeled "Browser". The other is not me, but it connects at the exact same time with the same IP, and is labeled "Mobile". I suspect this... well, I don't suspect anything. I'm a newb. But my guess is for some reason, my N900 started using two sessions at once to connect to GMail.
Mozilla/5.0 (X11; U; Linux armv7l; en-US; rv:1.9.2b6pre) Gecko/20100318 Firefox/3.5 Maemo Browser 1.7.4.8 RX-51 N900