This has got to be seen to be believed. When you email a multi-paragraph post to Posterous, it formats it, shall we say, differently than anything else I've seen.
Each paragraph is not enveloped in <p> and </p> pairs. Nothing at all in fact. However, CR/LFs are stripped and between each paragraph you get a <p />. GraffitiCMS doesn't mess with this, and so the post on my blog looks ... weird.
Now fixed on the boyet.com blog (I love having the source!). Mind you I'm just waiting to see what happens with those less-than and greater-than characters.