I just committed into trunk of rst2pdf a nicely working SVGImage flowable for reportlabs.
The code is self-contained in two files:
You can use them in your app if you want (I'd like to know, though). One of them is GPL/LGPL (it's basically copied from uniconvertor) the other is MIT-Licensed.
The output is astonishing: svg.pdf is only 32KB and completely resolution-independent. Graphics in your PDF That look good printed and on screen! And are not huge! Yay!
This will be the flagship new feature in tomorrow's rst2pdf 0.8.