The right way to do this is to change the size used
for h1 in the sitewide css file. In general you want to
preserve the semantic tags (things like h1, h2, ul, dl, etc)
and not use a tag to get a particular look.
I have been thinking we should provide a "designers roadmap"
to help people figure out how to easily change the look of the site but have not writen anything down yet.
On HEAD, developer support now shows all the includes used
to generate a page which helps a lot, but knowing which of the several places you could change is the right place to make a change is pretty hard.
