Not just for MIDI file pages, lots of general information. This is a fun site with lots of info on what NOT to do when designing a Web page. He doesn't just tell you what not to do, he shows you. Doctor HTML v5 - test the HTML on your page. Doctor HTML is a Web page analysis tool that retrieves an HTML page and reports on any problems that it finds.
Good writers use good grammar.
Grammar Girl Grammar Girl provides lots of great help with proper technical writing grammar. The graphics on our web pages were all made with Paint Shop Pro 5, and some also used the BladePro plugin. A real bargain. A free trial version is available so you can try it out and see how you like it before you buy. BladePro From Flaming Pear Software, a plugin designed for Photoshop, but works great with many other graphics programs, including Paint Shop Pro.