Fiction University has two great pages: The Spit Shine, which is a great last run-through, and more importantly, Crossing Words Off Your List, which covers the author's most important self-editing tool. The "Bad Words" list, which goes by many names, always serves the same basic prinicple: to help remove words which are either unnecessary or overused. Every author has a handful which are unique to them, and sometimes they aren't even words. (Confession: In The Cards had a lot of unnecessary ellipses before the final edit.)
Though those words are a good first step, they aren't everything. Grammar Girl's Editing Checklist covers the bases on ... you guessed it, grammar! This one is laid out simply, and yet very comprehensive, which makes it a good one to print out and keep in your editing binder if you prefer to edit on paper (like yours truly).
WordStream's Self-Editing Checklist includes talking points on all of the above, with an extra dose of humor. I take their final point with a grain of salt, however: they stress paring down your sentences as much as possible. While I'm a fan of a tightly written sentence, I also believe that keeping some of the proverbial meat on the bone helps you define your writing voice. Your mileage may, as with most method advice, vary.
Finally, there is my own Rainbow Editing Method, which I use in conjunction with my personal Bad Words file. I developed it while I was working on From The Desk of Buster Heywood, and it's gone a long way toward helping me identify my own problem areas. You're welcome to use it, too! There's a wrap-up post with links to all the sections right here.
Now, I'm about to dive into my own manuscript, so I'll see you all next Wednesday! Should you be up to the same task, happy editing ... and I hope you all have a great week!