Yes it does but it's not great at displaying them. They don't scale brilliantly on the eInk screen so you tend to want to zoom and pan which is clunky to say the least.
From my perspective I'd look at an iPad or Android tablet for PDFs for this sort of thing - it's really not the Kindle's strong suit.
In terms of moving stuff over - yep, you can just mount it as a drive and copy stuff across, or use one of several readily available tools for managing content (I use Caliber on the Mac, not sure if it's available for Linux).
From my perspective I'd look at an iPad or Android tablet for PDFs for this sort of thing - it's really not the Kindle's strong suit.
In terms of moving stuff over - yep, you can just mount it as a drive and copy stuff across, or use one of several readily available tools for managing content (I use Caliber on the Mac, not sure if it's available for Linux).