What would you say are some possible functions of a landmark bookmarklet? Will landmarks be shared among all users? I'm curious about the potential use cases, but I'm happy to help implement the idea.

I created a repository for the project at GitHub.

http://github.com/jccovey/landmarks/tree/master

Created a Google App Engine account to house the bookmarklet and the accompanying web service.

The name "landmarks" wasn't available, so I took the liberty of renaming the project to Instamarks. I updated the github repository to reflect the name change.

http://instamarks.appspot.com/

I'm working on a more compact UI for the bookmarklet itself. I added a stylesheet for the website, too.

I don't think we need to authenticate users with any kind of password - all people can save are html anchors on public pages - so I think we can get by with our own Users model that has an ID (string, 3-15 characters), maybe a hidden email address, and a timestamp rather than make people use their gmail accounts to log in.

I updated the bookmarklet UI substantially and deployed the latest code to App Engine.

http://instamarks.appspot.com/