Okay, I read the discussions about the yellow/brown spots on the leaves, and washed the leaves with mild soapy water. I don't have any of the plant oils/soaps...so I hope I didn't just help them towards their demise!

I noticed the spots a couple weeks ago, they began showing up on one leaf, kind of brown, then they multiplied and spread to other leaves but began to take on a silver sheen. One leaf turned yellow and fell off a couple days ago, and I think there is another one or two that will follow in the next couple of days. The Plumerias aren't very old, I got them at a Home and Garden show this early spring, and potted them when I got home, but they didn't start to leaf for a while after that (sorry I don't have exact dates).

Here is a picture of the leaf: http://www.ambrielartistry.com/img/PlumeriaLeaf.jpg

I hope that someone can help me, I am so depressed! I was hoping it would bloom soon, not start dying on me! :(