At first because 1 my machine's specs were too low to run a modern, Windows OS and 2 to support the FOSS philosophy. I switched OFF of Linux after discovering the beauty of OS X which outweighed my philosophical preference.

For Mac: WhatSize or DiskInventoryX

I already did all my traveling on bike when possible, so nothing changed.

I think a lot of people are missing the point of concept videos. The point isn't the UI displayed or voice vs mouse vs touch or privacy laws. The points I see are:

Why is this app better than just dragging a volume icon to the dock?

You can use OS X in the same way with Spotlight and Saved Searches. Just add a query requirement with Type:PDF and tag items using the Spotlight comments (command+I). Then you get Quicklook goodness too.

@magnoliasouth

You can get a Google Translate button without google toolbar - create a bookmark with this javascript:

No Mac or Linux support? What's the fun of having a fully cross platform browser without cross platform extensions?