Our close friend at I Think I’ll Pass finally transitioned his tumblr back to good ol’ WordPress.(original tumblr still open for socializing)
Although tumblr is dead simple for most people, once you want stuff like native commenting, better archives, categories, PuSH, etc, tumblr won’t cut it. This is a reason why I never caught on with Tumblr fully since I am a power user and I am so used to all the extras in WordPress. So much that I wouldn’t give it up for Tumblr.
Also, setting up an extra WordPress blog isn’t really hard nowadays. You’ve got fantastico, WordPress Multisites or perhaps your host have an auto installer for WordPress. So yeah, accessibility isn’t a big deal.