<p>Is Eclipse at all theme-able? I would like to install a dark color scheme for it, since I much prefer white text on dark background than the other way around.</p>

Here's a guy that posted his Eclipse preferences for changing the colors like a theme:
http://blog.codefront.net/2006/09/28/vibrant-ink-textmate-theme-for-eclipse/
And here's more about how to set the colors in the
Ganymede Eclipse version
(v. 3.4, mid 2008):
http://help.eclipse.org/ganymede/index.jsp?topic=/org.eclipse.platform.doc.user/concepts/accessibility/fontsandcolors.htm