Somebody had a thread to this effect a bit back, but I've lost it.
Some recent additions...
I finally tried using wax on a screw. Why did I never do that before? It's only suggested in every book in the world. It really works too!
I already mentioned making a miter sled, but that one was the easy one with the plywood factory corner. Easy to make, not so easy to use precisely. I saw a plan for another type long ago, and I finally dug it out and made one. It involves a right triangle cutout with a clearance hole in the bottom of the V.
Much harder to make well, but *much* more precise to use, since I can measure/cut straight lines and then trim the waste. I'm still dealing with a saw that has nothing good going for it, and these cuts still aren't absolutely perfect, but I figure if I can knock the point off with my thumbnail it's plenty close enough for me.
The down side is that this method is more wasteful, since the little triangle cutoffs are pretty useless. Less wasteful than having to re-make parts because you cut one 1/16" too short though. Maybe I can glue them up into some kind of turning blank after I make a bunch of these from different woods.