Stretched SVG Text has *awful* glyph spacing http://trac.webkit.org/export/37761/trunk/LayoutTests/svg/hixie/viewbox/preserveAspectRatio/001.xml I noticed this when looking at this test in chromium (which looks even worse using GDI text). Notice how the "It should stretch to fit the window" text is so poorly spaced (and it's also difficult to select). It's possible this is fixed in the latest sources. I was testing using 5528.1.
I expect we're doing something silly here, like aligning to pixel boundaries before applying the viewbox transform.
The patch on bug 12448 fixes this problem. *** This bug has been marked as a duplicate of bug 12448 ***