"tumblr all day and all of the night"
The tumblr app's improved a ton since it first came out. It now easily enables you to post from anywhere, whether it's photos, text, video, or links. Browse your subscriptions and like/reblog posts you love. It syncs neatly with the web version, and it's far, far easier to use than the mobile site.
tumblr's an amazing way to discover new stuff you'll love, if you manage to follow the right users. Tracing back the source of a post is simple, enabling you to find new streams of cool stuff that matches your taste. Posting updates to your own tumblr is also easy as pie.
There should be an option to queue up your updates and wait for a wifi signal to upload them.