Digging the Pos Neg end feed:
http://posneg.wordpress.com/2009/01/06/double-rainbow/

In Agglom you can save sets and lists related to specific topics that will ease your web experience and the ones of somebody else, if you decide to share them.

This is what I’ve been doing organically through liberated multi-user accounting at Twitter, through creating public password file drops and tumblr accounts. Seems like you have a similar sort of web strategy, which I find interesting. Will have to take a look at the software you’re describing. For me, at this point, its all about the ease with which I can integrate tools into my workflow for more densely productive creative time

You should also check out Agglom for just web-sharing.

Agglom is the place where everybody can easily save and organize any kind of set of links to keep private or to share with different levels of privacy.

Everyday millions of web users search the web for specific topics: have you ever spent hours to come across a specific list of interesting web pages that you would like to save? Agglom provides you powerful services to keep track of any list and set of links and, eventually, to share it.

This is why Agglom is the next generation of social bookmarking. In standard social bookmarking services you may have hundreds or thousands of saved web pages, in a huge unique list of tagged resources difficoult and hard to browse. In Agglom you can save sets and lists related to specific topics that will ease your web experience and the ones of somebody else, if you decide to share them.

Allows you to save open-tab sessions for collaboration and linking. Supports tagging and more. Would be excellent to have a feed for this blog.

https://addons.mozilla.org/en-US/firefox/addon/2109

FEBE (Firefox Environment Backup Extension) allows you to quickly and easily backup your Firefox extensions. In fact, it goes beyond just backing up — It will actually rebuild your extensions individually into installable .xpi files. Now you can easily synchronize your office and home browsers.

AND:
https://addons.mozilla.org/en-US/firefox/addon/2942

CLEO allows you to organize individual extensions/themes by combining them together into a single, installable file. This file can be used to install or restore a collection of extensions and/or themes.

You may have a list of your favorite extensions/themes that you would like to share with others. With CLEO, you can gather them all together into a single file (called, perhaps, “My favorite add-ons”) and post it on a webpage or email it to family, friends and co-workers. They can install the whole batch with a just a couple of clicks! (e.g., File > Open File…)

Useful tool for developers: I, as an extension developer, have several different Firefox profiles. Whenever I start a new extension, I create a new profile for testing, debugging, etc. In this profile, I like to have a dozen or so developer related extensions installed. With CLEO, I can package all these extensions together and install them into a new profile with just a few clicks.