Here is how I convert web sites to epub (or any other e-book format):
* I will first open desired webpage
* Then I will "readabilitize" it (
http://lab.arc90.com/experiments/readability/) It is quite easy, because you can get browser plugin or bookmark which does everything for you.
* Next, I save webpage to my computer (complete webpage)
* Finally, I run ebook-convert {webpage.html} {ebook-name.epub} to convert it.
I created script (I am using Linux, but I am pretty sure it can be done in Windows too) and defined it to file manager's right click function list so that I can convert saved web pages easily by clicking them with right mouse button, and selecting "Convert to ePub".
Readability step is optional, but it greatly improves the readability of the resulting document in may cases, so I would recommend it.
Plenty of manual work, but still manageable, I think. Does anyone have any easier way?