I ended up getting the Mobi cradle since it has both the cradle charging as well as a charging slot for the spare Google battery I bought. I'll use this until Google comes out with their own version (I get scared of harming the battery with too much charge since Mobi doesnt list any specifications so you dont know if its killing your battery, hopefully its not but its really the only game in town).
I ordered a spare battery from Google since the N1 is my main computer which I use for almost everything and need the extra juice to get me through the day but it would suck if I had to charge the phone up to 100%... then switch the battery and charge it again up to 100%... (hence the Mobi stand)