I’ve created two userscripts that are probably of use to some of you.
The first is a script called Real Entities that basically turns bullshit like “<3” in tags into understandable text like “<3”.
The second is called Tumblr Message Mod basically what it does is simplify sending a friend a link. A link you put into an ask box is translated into a friendly piece of text that Tumblr accepts and it is sent to whoever you were sending it to. If they have the same extension installed the friendly text is translated back into real people text. http://google.com becomes google [dot] com and that is turned back into google.com by the same extension. As an extra bonus, you can hit enter and actually create a new paragraph with this.
These are things I’ve made to make Tumblr a bit more useable.