I have mosaiced my aerial photography into a single image in ArcSDE
9.2, and while this is great way to view the data the downside is that
i can no longer use the info tool to tell which tile is which.

To this end i think the best solution would be to create a Fishnet
that can be overlaid and labeled to display each of the tile's names
(for reference only).

In ArcToolbox under Data Management Tools > Feature Class there is a
reference to Fishnet, but can anyone explain how this is done for a
raster?

Many thanks