Interesting feature - still it's a lot easier to just use Thunderbird since it has native support for gmail. You can later just edit a few settings, and you'll be able to have all of your emails + attachments offline, plus all the other features of gmail... So I still don't get it why people want to have everything in the web browser. Like, there are even games like Quake Live and Battlefield Heroes that are played IN browser - what's the point of that!?