For anyone interested in the Cascade pattern, or for using that technique to create other quilts, I just wanted to mention that the block size (after cutting, marking, and sewing diagonally across the 10.5" squares) will be a little over 9.5" unfinished. At that point, if you want precision, you can trim the blocks to an exact 9.5" centering your ruler on the diagonal line.
Also, I wanted to mention that a similar technique is used for a quilt pattern called Hidden Wells. Here is a link to that pattern:
http://www.reddawn.net/quilt/hwells.htm
The difference is that Hidden Wells ends up with blocks that have bias edges; the technique used in Cascade has the advantage of sewing the diagonal before cutting *and* of having the block edges end up on the straight-of-grain.
If you can manage the bias edges, Hidden Wells appears to be a very fast and interesting pattern that does not require matching seams. Someone posted here on the QB that a Yahoo group has formed exclusively for the Hidden Wells pattern (as a spinoff from the Stashbusters group). The name of the new group is HiddenWells and you can join at groups.yahoo.com