Inkscape 0.45 UPXes down fairly well
Thought some of you might want to know that you can get the extracted 7z version of Inkscape down by about 20-30MB with UPS (I used UPXShell, and chose the 7z version to avoid initial installation). It's still over 100MB if you leave all files intact, but I'm sure there are loads of readme-type files that could be sacrificed.
Still, so far, I have compressed all the DLLs found anywhere within the inkscape folder tree, plus inkscape.exe and inkview.exe - not yet bothered with python.exe or other files - and the app works fine.