I have a panasonic FZ28 and I will be buying a new Nikon DSLR by this thanksgiving holiday and that's another story of deciding about the model.
Coming to the question, I have a MBP13" and the iphoto edits are very limited. Looking to buy a software for it. Should go with PS elements or CS or aperture.
I do not do RAW conversion for now (I hope I would never do it) but mostly like editing the photograph with layers and masks. I have very little knowledge on using PS but very sure that I would learn to use it. I will also be using it with the SLR that i buy.