A vector art program written in Python by Bernhard Herzog.
It's very much similar to Corel Draw!. It's actually very much usable even if it's not feature-wise as good as some other vector packages - but all of the basic functionality is there. It also has some pretty strange things (gradient fills are pretty hard to make right, or maybe it's just unintuitive...)
You can draw with vectors, do pretty normal effects, save in its own format or export to many other formats (SVG and PostScript supported, of course).
Too bad the widget set is horrible... =(
Home page, as of writing: http://sketch.sourceforge.net/ - also available as Debian package. See also Sodipodi and Kontour.