Osmanthus fragrans (Tea Olive) would be my guess. Mine is blooming its head off right now, too.

Eleagnus ebingii?

Here is a link that might be useful: Eleagnus ebingii

I agree with rhizo. It sounds like tea olive (_Osmanthus fragrans_) or one of the other members of the _Osmanthus_ tribe. Our tea olives had their major flush of blooms a few weeks ago, but will be flushed with blooms again at different times during the fall, winter, and early spring. Of course, it could, as Flora suggests, be a form of _Eleagnus_, which produces sweetly-scented fall blossom that are off-white in color.

OOps, I didn't read chris's question very carefully. He/she indicated that sweet olive (tea olive?) might not be an option. Then, without any picture, or further comments from the original poster I guess the plant is probably Ugly-Agnus. Very sweet fragrance.