The practical thing is that when you submit as a blog post, other people might link to you. Noone is going to link to a post they read on HN. But a blog post?

The practical thing is that when you submit as a blog post, other people might link to you. Noone is going to link to a post they read on HN. But a blog post? Oh yeah. Remember my rant a few weeks ago about how the Crunchies were the kid's choice awards of the web? That got picked up by LA Times and they linked to my post in one of their stories. I doubt that'd happen if I posted the same exact thing as a "Tell HN" post.