The Heading tags are still there, drop down menu items under "Paragraph" which may be what ppc910 is referring to. They are not meant to be used to make text big and bold, though.
This article discusses the proper use of those tags:
Headings Are Important
Use HTML headings for headings only. Don't use headings to make text BIG or bold.
Search engines use your headings to index the structure and content of your web pages.
Since users may skim your pages by its headings, it is important to use headings to show the document structure.
H1 headings should be used as main headings, followed by H2 headings, then the less important H3 headings, and so on.