Hi Dan,
you can see a Matt Cutts video about this (see the attachment).
In my opinion it's better to focus on one H1 per page in order to focus the attention of the crawler on only few main keywords. All H1 have to be different. Take care about pagination, since you can easly duplicate meta tags and H1. In order to avoid it, use the meta FOLLOW,NOINDEX and use the canonical tag.
Luca
