Sorry Liz, I do tend to get off topic. The boomerang collar, also called (I think) a magic collar was apparently developed by Louise Cutting. I learned about it in a newsletter from Timmel fabrics. There are details here somewhere, I think the topic had to do with getting a "crisp" collar - I bet you can search here for "crisp collar" and find it. In a nutshell, you make an extra collar pattern piece, split it so that it's on each end of the original collar piece, then if you fold it in half it looks like a boomerang. You cut the pattern piece on the fold, sew the two ends together and the long edge, turn, and voila, a collar with no seam at the pointed parts. \
I am a lazy sewer. If a step irritates me, and I can avoid it rather than learn to do it properly, I'll take the easy way out.

Edited: Aha! I did a google search and found Nancy Zieman's instructions for a magic collar - looks like the same thing as boomerang. Here's a link:
http://www.nancysnotions.com/jump.do?itemID=5&itemType=LANDING&page=Collar