TheTumbler version 2 has change a lot since I last tried it (version 0.9). It still has a sparce interface but with more extras. Now, you can use it to reply to your Disqus account comments (even if they are on different sites) [Update: the replies appear as an unclaimed Disqus Guest comment and not my logged in Disqus account], use InstaPaper to allow later reading of Followed posts and use Delicious to bookmark posts, or subscribe to a feed with Google Reader. Also, TheTumbler can recognise the MarkDown formatting entry method if you wish to turn it on [Untested]. A problem it shares with the Tumblr app is that I find it virtually impossible to re-edit a post of more than a few lines long because the browser text entry window will not scroll to the bottom of the text. Creating a post does not have this problem.