Yeah, I use a Fong diffuser too for my Nikon flash. My other lights are Lumedynes and battery powered, so I use them inside and out. I use Softlighter umbrellas, that have a diffuser which makes them into soft boxes. Very versatile system, and cheapish too.
To post pictures from the quick reply use the 3rd icon from the right. It looks like a picture of a tree or something. It'll give you the option to select a file from your computer or from a link. In the post it'll be thumbnail size and you just click on it to enlarge. Not sure what the file size limits are though. This one is 900x598, resolution @150.
EDIT: a word of warning, the pics really change they're look posting this way. Using a link seems to work slightly better.