Ok, read the other comments to see how good this is.

Then there's:
Quote Article
Related Articles
Keywords
Send to delicious

It's a blogger's dream

What else is there to say.
Why would you NOT use this?
Along with Community Builder, JoomBackup and a few others, this should be part of any Joomla install.
It's unfortunate it has to be a hack, I think it should be part of core.

This mambot appears to be working properly, showing:
Tags: keyword1 keyword2 etc. below each summary or detail view of item(s)

However, now my summary/detail items also show a number, usually "2" above all titles. i don't know where this comes from?

This bot is very powerful, because it allows your users to submit content to your Joomla site from their email client.
Since it also accepts HTML emails, you can submit content with images already wrapped/formatted very easily.

Warning:
Default config fires mambot based on site visits. I have found this can slow your site down considerably.
Use the cron job.

Cron Script Old
The cron script is old and based on Mambo, needs some reworking.

This is very powerful tool for offering special pages to clients or to CMS administrators.
Put all your cpanel admin pages here, aggregate all applications related to the CMS here like dotproject, roundcube webmail, etc.

This goes a long way toward helping CMS administrators unify the digital world of the CMS community, whether it's commercial, NPO or personal.

You can associate your users with different custom login types (cpanel, roundcube, dotproject, wikis, etc.) and assign each user a unique pw to that application.

Some Issues:
Passwords stored in msyql as cleartext - not secure

The login options are somewhat confusing, documentation is limited, considering each application has its own settings and may be finicky about being wrapped in an iframe.

Some logins by Joomla user don't work, whereas if you hardcode the single-signon user/pw it does work. Needs a bit more work there.

With the new update, you can now use simple brackets [ and ] to contain a reference to another page [Joomla Extensions] or to a Shortlink [Google News]
It's so simple it's turning my sites into pseudo wikis without the hassle of another component or bridge.

As usual, simple tools that are powerful are the best.
Drop a feed in your content and embed long lists of links in there that related to the subject in question.
Very useful for articles, documentation, enriching your site.

One small problem I find is that some feeds (especially searches in google news) are very finiky and sometimes don't show up.

I love this component, it's almost like a whole application unto itself. Use it in several community sites.

I love this extension, it's truly indispensable.
As your site grows in content, how can you manage all those internal references to existing pages!!?
{ln:calendar} {ln:register} etc. are so easy to use, it's almost like having wiki power in your site.

Of course if you have a lot of references to Wikipedia and many other external DBs like dictionaries, google etc., you can do all that here in a snap. Truly amazing

I love this module! If you are at all interested in SEO, and helping your site users navigate across your deep site content that may not always be in menus, this is perfect.

You can use tags as the method to relate content to other content.
This helps discipline your use of tags, makes your tag clouds better, and helps with SEO as you have internal references to deep content.

Most importantly with the inline mambot, you can make it really look like you are editing your content carefully when in reality it's quite dynamic.