Um , not starting a flame war here, but IMO, there's nothing wrong with using H# tags in posts, particularly if they help to identify breaks in the post. I mean, that's what they're meant for when you think of HTML as a content markup language.

That said, if you don't like the H# tags on PM, there's a very simple solution: fix them in your site CSS. Specifically, the following in your user settings should cause H tags to appear simply as bold text at your default font size. Flavor to taste:

H1 { font: bold medium; }
H2 { font: bold medium; }
H3 { font: bold medium; }
H4 { font: bold medium; }
H5 { font: bold medium; } 
H6 { font: bold medium; }
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Dr. Michael K. Neylon - mneylon-pm@masemware.com || "You've left the lens cap of your mind on again, Pinky" - The Brain
"I can see my house from here!"
It's not what you know, but knowing how to find it if you don't know that's important