Tumblr is again forcing me to recognise its superiority, from the suprioer look and feel, the user interface, not having intrusive advertising disrupting my ability to create posts.. But my main point here is exploring and discovering posts by others. Tumblr has the perfect link to click: 'Explore' - and there you can view community edited feed for various tags/catergories - with great stats on all of them. 'Music', 'Tech' etc. You can see the latest and most popular posts in that category, and the quality is brilliant.
I have yet to find such a feature on TypePad, but I also have little desire - The dashboard doesn't excite me the way Tumblr can, it feels sterile as opposed to looking good, and I feel cut off from what's going on in the community around me.