There is an old WebmasterWorld thread on the topic of how many header tags (i.e. H1, H2) you should have on a page and how you should use it. The thread was revived yesterday when Matt Cutts of Google answered a question on that topic on video. Here is the video:

So there you have it. Don’t wrap all your content in the H1 tag. You can use it multiple times on a page but use it for page heading above paragraphs of content. Don’t over do it.

WebmasterWorld’s Tedster disagreed a bit with Matt, he said:

Forum discussion at WebmasterWorld.