Desktop Publishing for Unix?

weierophinney asks: "In a past job incarnation, I was a graphic artist and page layout technician for a small guidebook publisher. We were a Windows-based shop, and I used Macromedia Freehand for drawing maps, Adobe Photoshop for scanning and sizing images, and Quark XPress for book layout. I have since moved on to web programming, but occasionally want to do something that would use these tools. While I use GIMP regularly, I have yet to find a -good- free, open-source, alternative to the 2D vector graphics programs I used, or a page layout program with the power of Quark XPress. Is anybody in the Linux community doing publishing or using such tools, be they commercial or otherwise? Is Linux a viable option for small publishers (where profits are often slim and money for software upgrades is sparse)?"