I recently released a Tumblr iPhone app, called Readlr, and this pretty much sums it up. You should know that ilovecharts is one of the featured tumblelogs the app ships with! Hopefully you get a few more followers (mainly my Dad) because of it. Peep readlr.tumblr.com for more info, I think you will get a kick out of it.
I did indeed get a kick out of this. I recommend the app to those who want an easier way to organize and keep up with their favorite tumblogs (hopefully us included) on their iPhones.