[dnaknitter]

Thanks for this! I was really stumped as to how to send links to Instapaper FROM my Kindle, but I'm now using your idea as follows:

1) When you're on a page you want to add to Instapaper, using the "Enter URL" option on your Kindle, type in at the beginning of the address "tinyurl.com/create.php?url=" (you don't actually have to type in the http:// and the rest is short enough to memorize so you can do it quickly) and press "Enter" to take you to the tinyurl.com URL-shortening page.

2) Assign each page a name following some system you make up using VERY SHORT names that you can remember (such as "jan0120111" for the first file you rename on Jan 1, 2011). You might want to put a random letter in there somewhere to make it more likely no one else will be using your filenames!

3) Go to your email account on your Kindle, in which you've already set up a contact for the long, weird email address of your Instapaper account.

4) Send an email to that address, in the body of which you've typed the shortened name you've just assigned to the page you wanted to send.

The page will be added to Instapaper, and you can adjust your settings so new pages will be emailed to you every day. It's hardly a streamlined, one-click solution, but it does work and doesn't take too long.