Google Operating System reports that Google has updated Google Bookmarks to allow you to create lists and share those bookmark lists with others. The bookmarks feature is not new, Google enabled you to store bookmarks and search them. The sharing feature is also not new, Google did once give you a way to share them, in fact, you can share them on Google Buzz I believe. But now, in Google Bookmarks at google.com/bookmarks/l, you can directly share them.
Here is a screen shot:
You can learn more about Google Bookmarks over here.
Update: Google just posted on this new feature.