Originally Posted by Aurora
At Wal-Mart they have a June Tailor contraption "Perfect Half-Squar & Quarter-Square Triangles ($12.97). Along the sides (one side for marking and the other side for cutting). On the marking side you line the blue line up with the point and draw your lines in the slots on either side of the blue line. On the cutting side, you line the cutting slot up with the points and the dash lines up with your stitching. I just bought one and it works great, much better than those little narrow rulers.
This June Taylor product is also wonderful for squaring up your blocks after you've made them.
I have computer disc called "Triangulations: Half Square and Quarter Square" by Brenda Henning (Bear Paw Productions). It's like Thangles, but you can just print out the size and number you need. After sewing my HST with these, I use The June Taylor "contraption" to square them up. This has taken a lot of the headache out of HST for me.