A couple days ago I was lamenting the lack of a good visual tool to work in Oracle with.

After all, there's only so many times you can do something in Notepad++ before you're wanting to pull your hair out.

Anyways, a wonderful commenter (thanks again, Justin) stopped by, and pointed me towards Oracle's SQL Developer. It's a free tool provided by Oracle that does almost everything I wanted from such a tool (it might do everything, but I haven't found a database diagramming option-of course that could just be merely that I can't find it, after all I've only been playing with it for a little bit.