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Thanks a million webmasters :)
Skye
Personally I'd always try to stick to one site because it is easier to promote one than several. Of course there are many exceptions and all cases are unique. You can find many threads about this subject here at WebmasterWorld.
H1-H6 are heading tags, with H1 being the biggest and H6 the smallest. You normally use them for headlines and most webmasters choose to set their size using css because the h1 and h2 are HUGE. They are part of the details in a site that are considered beneficial for good SEO. Having heading tags alone won't bring you anywhere, but in combination with other SEO practises they are supposed to help a little. Cheers! :)