I will also post this as a tut, as 3 or 4 people have asked me about it.
Half square triangles are basic to a very large number of quilt blocks. The old way is to cut 2 traingles, then try to get them together without stretching the bias. The new way is much easier:
Take 2 squares 1" bigger than the finished size of the HST you want. Mark one diagonal on the lighter fabric. Pin the squares right sides together. Sew 1/4" away from the marked line on each side. Cut on the marked line. Press. The 2 squares you now have are very slightly bigger than you want.
Using the diagonal line on your ruler as a polacement guide, trim away the excess and 'fine tune' your block at the same time. The same method works whether your finished HST will be 1" or 12" I'll retake the photos later.