Ok, this isn't a buy now question like those that seem to be multiplying around here. It's about battery life. I haven't found a good thread about this, nor can I get any good, real numbers on the web. So... I am 90% going to end up buying a 12" PB new withing the month. Portability is an issue so the 12" is highly preferred. However, I really would like to hear about the battery life on the little guy from current users. How much run time is typical for your 1.5Ghz 12" PB? What about with airport on? Screen brightness? Etc... Also, does anyone have any comments on Othe World Computing's PB battery replacements? Might be nice to grab an extra if they are any good. Thanks guys. *PB not iBook. I know the iBook battery life is better; it's just not an option here.