That's a good question, pyroman. After you've added you Kindle email address, we'll give you a bookmarklet to use to select webpages to be sent wirelessly to your Kindle.
I've just added that note to the page where Hatchet requests your Kindle email address.
I'd love to have a conversion service where I could paste a URL for a pdf, have it converted and emailed to my kindle. I'd pay for that.