The website has been significantly updated since January when last mentioned here. Here is a working version as of April 20th. You can also find the ePub at archive.org, if a downloadable file would be better.
How do you feel about your writing? Can you communicate effectively on paper or with a keyboard? Do you write with style and impact? Do you write slowly or quickly? These are all questions that writers ask themselves. As with any pursuit, practice is essential. When in doubt, write more. Along with that, read more. Learning fundamental writing conventions and techniques are also important.
This is a reference website with three main sections: academic writing (papers), fiction writing, and poetry. Information provided is generally consistent with U.S. high school and university guidelines. However, writing is a vast field, and each instructor and institution has their own set of preferences. When in doubt, ask your instructor for their expectations. Finally, make your own decisions and find your own voice.
Cool find! Wish I had something like this back in high school.