wordpress tag
 

Author tags
the_author
the_author_description
the_author_login
the_author_firstname
the_author_lastname
the_author_nickname
the_author_ID
the_author_email
the_author_url
the_author_link (Version 2.1)
the_author_icq (Deprecated)
the_author_aim
the_author_yim
the_author_*** (Deprecated)
the_author_posts
the_author_posts_link
list_authors (Deprecated)
wp_list_authors

Comment tags
comments_number
comments_link
comments_rss_link
comments_popup_script
comments_popup_link
comment_ID
comment_author
comment_author_IP
comment_author_email
comment_author_url
comment_author_email_link
comment_author_url_link
comment_author_link
comment_type
comment_text
comment_excerpt
comment_date
comment_time
comment_author_rss
comment_text_rss
comment_link_rss
permalink_comments_rss

General tags
bloginfo
bloginfo_rss
get_bloginfo
get_bloginfo_rss
wp_title
wp_get_archives
get_archives (Deprecated in 2.1)
get_calendar
get_posts
wp_list_pages (Version 1.5)
wp_dropdown_pages
wp_loginout (Version 1.5)
wp_register (Version 1.5)
query_posts (Version 1.5)
rss_enclosure (Version 1.5)
wp_tag_cloud (Version 2.3)
the_search_query (Version 2.1)

Link tags
edit_post_link
edit_comment_link
wp_link_pages
link_pages (Deprecated in 2.1)
get_year_link
get_month_link
get_day_link
previous_posts_link
next_posts_link

Permalink tags
permalink_anchor
get_permalink
the_permalink
permalink_single_rss

Tag tags
wp_tag_cloud (Version 2.3)
the_tags (Version 2.3)
get_the_tags (Version 2.3)
get_the_tag_list (Version 2.3)
single_tag_title (Version 2.3)


Category tags
the_category
the_category_rss
the_category_ID (Deprecated)
the_category_head (Deprecated)
single_cat_title
category_description
wp_dropdown_categories (Version 2.1)
dropdown_cats (Deprecated in 2.1)
wp_list_categories (Version 2.1)
list_cats (Deprecated in 2.1)
wp_list_cats (Deprecated in 2.1)
in_category
get_category_parents
get_the_category

Date and Time tags
the_date_xml
the_date
the_time
the_modified_date (Version 2.1)
the_modified_time
get_the_time (Version 1.5)
single_month_title
get_calendar
the_weekday
the_weekday_date

Geo tags
Geo features were moved to a plugin implementation with WordPress 1.5. Tags in parentheses are the plugin version.

print_Lat (the_Lat)
print_Lon (the_Lon)
print_UrlPopNav (the_UrlPopNav)
print_AcmeMap_Url (the_AcmeMap_Url)
print_GeoURL_Url (the_GeoURL_Url)
print_GeoCache_Url (the_GeoCache_Url)
print_MapQuest_Url (the_MapQuest_Url)
print_SideBit_Url (the_SideBit_Url)
print_DegreeConfluence_Url (the_DegreeConfluence_Url)
print_TopoZone_Url (the_TopoZone_Url)
print_FindU_Url (the_FindU_Url)
print_MapTech_Url (the_MapTech_Url)

Links Manager tags
get_links_list (Deprecated in 2.3)
wp_get_links (Deprecated in 2.3)
get_links (Deprecated in 2.3)
wp_list_bookmarks (Version 2.1)
wp_get_linksbyname (Deprecated in 2.1)
get_linksbyname (Deprecated in 2.1)

Post tags
While in The Loop, these values can be accessed through the $post object.

the_ID
the_title
the_title_attribute
single_post_title
the_title_rss
the_content
the_content_rss
the_excerpt
the_excerpt_rss
previous_post_link
previous_post (Deprecated)
next_post_link
next_post (Deprecated)
posts_nav_link
the_meta
the_tags (Version 2.3)

Trackback tags
trackback_url
trackback_rdf

http://codex.wordpress.org/Template_Tags