Joomla Plugins are also known as Mambots (for Mambo). Plugins allow extension of the core and dynamic processes in Joomla and Mambo during runtime (page load).
Joomla Tagbot is a mambot/plugin that gives visitors to your site the ability to bookmark any article (content item) in one of the many Bookmark or Tagging sites such as Digg.com, Furl.net, Spurl.net, Del.icio.us etc. This is a quick release the fixes the bug in version 1.0.6 Beta 1:
Change Log: 1.0.6 Beta 7.1
Fixed Error in PHP5: "Only Variables should be assigned by reference".
Change Log: 1.0.6 Beta 1
Added a Cache to lessen memory usage. Now the Tagsite XML config files are cached and only "re-parsed" if you make a change to the xml files.
Added configuration option 'Display Position' to allow tagbot to
render inside of the main content section, as well as outside it. This
works in conjunction with the 'Display Location' property so that tagbot
can render at the top, bottom, or both.
Reworked a substantial portion of the code to make it easier to
maintain, as well as implement the new feature.
Significant amounts of configuration data were being cached in
memory multiple times. This has been removed.
If the custom CSS option was selected, it would only be included if
you selected to render the tags before the content, or both before and
after the content. If you only selected to render the tags after the
content, the default CSS would ALWAYS be used.
This mambot allows you to attempt to tidy your article xHTML to W3C standards compliance. It uses the tidy parser extension for PHP. If you don't have this enabled, then you need to install the extension for PHP4, or enabled it in PHP5.