b - <strong></strong> HTML tag for strong emphasis of text (i.e. bold).
i - <em></em> HTML tag for emphasis of text (i.e. italicize).
link - <a href="http://example.com"></a> HTML tag to create a hyperlink.
b-quote - <blockquote></blockquote> HTML tag to distinguish quoted or cited text.
del - <del></del> HTML tag to label text considered deleted from a post. Most browsers display as striked through text. (Assigns datetime attribute with offset from GMT (UTC))
ins - <ins></ins> HTML tag to label text considered inserted into a post. Most browsers display as underlined text. (Assigns datetime attribute with offset from GMT (UTC))
ul - <ul></ul> HTML tag will insert an unordered list, or wrap the selected text in same. An unordered list will typically be a bulleted list of items.
ol - <ol></ol> HTML tag will insert a numbered list, or wrap the selected text in same. Each item in an ordered list are typically numbered.
li - <li></li> HTML tag will insert or make the selected text a list item. Used in conjunction with the ul or ol tag.
code - <code></code> HTML tag for preformatted styling of text. Generally sets text in a monospaced font, such as Courier.
more - <!--more--> WordPress tag that breaks a post into "teaser" and content sections. Type a few paragraphs, insert this tag, then compose the rest of your post. On your blog's home page you'll see only those first paragraphs with a hyperlink ((more...)), which when followed displays the rest of the post's content.
page - <!--nextpage--> WordPress tag similar to the more tag, except it can be used any number of times in a post, and each insert will "break" and paginate the post at that location. Hyperlinks to the paginated sections of the post are then generated in combination with the wp_link_pages() or link_pages() template tag.
lookup - Opens a JavaScript dialogue box that prompts for a word to search for through the online dictionary at answers.com. You can use this to check spelling on individual words.
Close Tags - Closes any open HTML tags left open--but pay attention to the closing tags. WordPress is not a mind reader (!), so make sure the tags enclose what you want, and in the proper way.
Workflow Note - With Quicktag buttons that insert HTML tags, you can for example click i to insert the opening <em> tag, type the text to be enclosed, and click /i or Close Tags to insert the closing tag. However, you can eliminate the need for this 'close' step by changing your workflow a bit: type your text, select the portion to be emphasized (that is, italicized), then click i and your highlighted text will be wrapped in the opening and closing tags

Additional WordPress Resources:

For additional WordPress support and assistance, we recommend visiting the WordPress Support sites at: http://wordpress.org/support/ and http://codex.wordpress.org

For access to the WordPress Forum (which may provide further support tips), visit http://wordpress.org/search/?forums=1 or http://wordpress.org/support/