What is Worth Hole?

日本語版はこちら。

Worth Hole lets you add notes and bi-directional links anywhere on the web for later use.

• Take notes directly on web pages.
• Two-way linking of any part of the web page.
• Supports HTML and PDF on the Web.
• Most functions work on smart phones.
• Share notes between multiple personal machines or multiple users

And so on. Click here for Developer-to-developer review, but since it is in Japanese, please translate it automatically with your browser.