H1 tags are the most prominent heading tags that are recommended for placing the general topic or theme of the page in. It is best to include the main keywords of the page by either matching or writing something closely related to the already well researched title tag.
Comments (2)
Sure they help, but I wouldn't call them very important for your rankings at all, especially with the big G. If this is weighted in the overall algorithm I would say it would be very low. Things like this are just too easy to spam and manipulate.
I had no idea that search engines actually counted this when calculating your rank, this whole time i've been ignoring these in CSS! Oh what a fool I am.