Joomla! Extension -- JoomSEO

JoomSEO is a Search Engine Optimizing(SEO) bot making Joomla content more Search Engine Friendly(SEF).
JoomSEO dynamically creates meta keywords, meta descriptions, changes the title on the fly (Adds the sitename for Joomla 1.5), adds heading tags to content titles and more.
JoomSEO is highly customizable and saves the hassle and time of manually adjusting these settings, keeping all words and descriptions relevant for the search engines, improving ranking and accessibility.
JoomSEO has many options giving you control and flexibility including,
* Show, hide or override keywords, site name, content title, first paragraph in the title and more.
* Adjustable element order in the title.
* Supports variable phrase lengths
* Override meta data per page
* Sticky words to give keywords more weight.
* Bad words and characters to exclude from the keywords.
* Enable or disable elements on the front page.
* Front page title and meta replacement text.
* Heading tag selection (Add H1, H2, H3 tags to content titles)
* Caches content in the database for superior performance.
* Converts stray Microsoft Word characters that can harm SEO
JoomSEO has come a long way making Joomla more SEO Friendly, please upgrade and enjoy.
(JoomSEO NOW supports Joomla 1.5. JoomSEO 1.5. Now works on any component including template / module parsing thanks to the new Joomla API. Thanks to the complete Joomla Team)
Some of the additional feature of JoomSEO for 1.5 include
* Site Name in the title (from the word go)
* Parses any component / template
* Runs in Native Mode
* And more
The new version 1.1 includes some great new features and optimisations, please update to the latest version
On the horizon
* {joomseo tags} Parsing tags to disable individual pages or perform other functions

Search Engine Friendly URLs --搜索引擎友好链接

这是一个看来反响相当不错的扩展，在joomla.org上面的反映比较热烈，评价也比较高，但好像只支持英文。
http://extensions.joomla.org/component/option,com_mtree/task,viewlink/link_id,1830/Itemid,35/