Try patchpieces.com
There is a link on the left that opens up a page to guide you for setting triangles on corner. Print it out or save it to file (move curser over the central bottom of the page and click on the save icon).
You could even make strips of fabric sewn together, then cut a triangle from them to create your 'log cabin' look.
For those interested and whomever struggles with flying geese, there is also a link for doing them. Same way Eleanor Burns does them (FAST!), but nice to have it in print.