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After playing around with Tumblr for months (I'm cdevroe over there), I finally noticed that the little "page curls" that happen on-hover on posts on my Dashboard from those whom I follow are actually the permalinks to those posts. Man do I wish I found that sooner! I can't tell you how many times I've actually gone to the Tumblr page of the user who posted something I wanted to find the permalink to, scrolled down the page to find the post, and clicked on the date (or whatever their theme had that was clickable). Ugh.
Though I do like the idea, I think this link should be much more apparent.
Side note: A single RSS feed for posts from everyone I follow would be stellar. Maybe it is there and I just don't know it?