Dwscamel, my "minimalism" playlist on iTunes has 197 tracks, so you can tell I really like this thread!
Einaudi is sheer genius as far as I'm concerned (and my favorite composer for piano). You've got him covered, though, so I won't add any more videos by him.
Other composers in a similar vein include Wim Mertens, Alessandra Celletti, Josh Winiberg, Bruno Bavota, Giovanni Bomoll, Max Richter...I'd better stop now before I get out of control. Here's a few of my favorite pieces:
Wim Mertens, Struggle for Pleasure.
[video:youtube]qXLjzBEL6kw[/video]
Giovanni Bomoll, Tropical Dream:
[video:youtube]n1h2caJIKE4[/video]
Josh Winiberg, Sunrise:
[video:youtube]x2YL-vp1jIQ[/video]
Alessandra Celletti, Golden Fly One:
[video:youtube]yxOmjX3vXso[/video]
Bruno Bavota, La Danza delle Stelle:
[video:youtube]5l-1_EJoptI[/video]
Max Richter, Sarajevo:
[video:youtube]ZTvhR0lEtZM[/video]
And then there's this wonderful video by Noah Adams using Carly Comando's "Everyday." (Worth having to skip through the ad if you've never seen it.)
[video:youtube]6B26asyGKDo[/video]