Disclaimer The opinions expressed herein are my own personal opinions and do not represent my employer's view in any way.
During my holidays, I installed the Sharepoint Server 2010 public beta.
It's quite heavy to run it in a VM. I finally installed it using VirtualBox on a W7 64 bits computer with 4 GB RAM. It's far from the ideal speed but it's usable.
I won't go through the Central Administration here. I just created a Web Application, a site collection and a site. This is more comfortable with the new Central Administration:
I then created a Team Site in this site collection. All of that is quite similar to what we do in WSS 3.0./Sharepoint 2007.
When your site is created, and if you've the right permissions to do it, the easier way to create a document library is to use the site actions menu:
In this list of actions, you'll find the action "New Document Library.
If you click on it, you'll not be lost if you already know Sharepoint 2007/WSS 3.0.
Once a document library is created, we can meet the new ribbon of Sharepoint 2010. This ribbon is, of course, contextual.
For a document library, we can observe 2 linked tabs : a Documents tab and a Library tab.
The Documents tab is used for all the features linked to documents : check out, check in, versions, permissions, workflows, …
The Library tab is used for all the features linked to the library itself : views, settings, connections, exports, permissions, …
As for WSS 3.0/Sharepoint 2007, a contextual menu is available on a file saved in a document library:
Remember Me
a@href@title, strike