My name is Will Pittenger. I have been making KMZ sets for Google Earth for a long time. After I starting making those, I wanted overlays for my sets. I was unsatisfied with the accuracy of the images available at Wikimedia Commons. So I started making my own with Inkscape and uploading them. Then I needed a place for anyone that liked my KMZ sets and/or maps to find others. For a while, a simple blog sufficed. But, once I started getting requests, I knew I needed something better. This site is the result. You are welcome to set up an account. Some activities are for registered users only. Take your time poking around and let me know what you think.
Well, that depends. That is really three questions.
Saving files (as of version 0.47)
SVG—This is Inkscape's native format. Note: Inkscape actually supports two versions of SVG. Their own version adds some tags for their own use. "Plain SVG" strips them out.
PDF—I haven't tried it. Support might be limited. Fortunately, Adobe released their patents and control over the format to a non-profit organization. If they hadn't, Inkscape probably wouldn't support it.
SVGZ—Compressed SVG; you can either include or omit the special Inkscape tags.
Inkscape uses the GNU Toolkit Framework. It will install it if you don't have it. (Some variants of Linux come with GTF preinstalled and use it for their UI.) Inkscape 0.46 uses it excursively for the UI. 0.47 has moved to using the OS for most of its UI, at least in Windows.