just found this little gem of a tutorial at deviantart...
link: http://www.deviantart.com/deviation/46507939/
simulating depth of field tutorial
Re: simulating depth of field tutorial
hrum has a pretty impressive gallery of Inkscape work. You can also find that tutorial on the Inkscape 0.45 screenshot page, along with a bunch of other nice tutorials that shows off Inkscapes potential and power.