The part I find most interesting is that the amount of ad space so far looks pretty okey. Maybe they'll crank it up a bit when it goes public. But it looks pretty slick compared to MSN / Hotmail. I wouldn't use Hotmail at all if it didn't integrate with Outlook.
Those flashy ads are just horrible. And it's only 20 (?) Mb of space? Maybe GMail isn't so bad. Wonder what MSNs move will be?
(Image from Extremetech for those that think the article is a bit on the long side.)