Have you tried
Instapaper? I've use its app since I have my iTouch, and works really great for reading long article that I don't have to read right away. And it can works from PC's browser by just installing bookmarklet, and you're good to go. As far as I know, it will strip down all unnecessary element in webpage (no ads, yay!!) and just display text and its images.
I've just tried dotepub based on previous recommendation but it is limited to convert one webpage at a time. While with Instapaper you can save a lot of webpage and offer option to convert it to epub and mobi.