Really nice implementation.<p>Couple of comments:<p>The input box doesn't give visual feedback on text highlight. I was trying a few URLs and it took me a second to realise I had selected the text to overwrite (disappeared on backspace).<p>The save dialog always presents the filename as slideshare-as-a.gif. Suggest you use the last part of the slideshare link to generate the filename.<p>Updating the location bar dynamically when adjusting settings as well as using query params is always useful.<p>Being stuck with a wiki that won't allow linking to slideshare, I can see a real world use for this.<p>Is there an API available?<p>Minor points aside, looks and works great.