Well, I might be able to help with a few sites I have in my favourites...
NASA Dryden photo site:
http://www.dfrc.nasa.gov/Gallery/Photo/index.html
Not the best for space craft, but it has a few of the shuttles, and the X-15 which can be considered a space craft. Also a lot of other neat things there (Lots of the old X vehicles, aerospike rocket lauhch, Lunar Landing Research Vehicle).
New Horizons site:
http://pluto.jhuapl.edu/
The probe to pluto that launched only recently. Not much more to say about it really.
Orbiter site:
http://orbit.medphys.ucl.ac.uk/orbit.html
This is a site to a space simulator called orbiter. Best place to look for pics would be the gallery or forum. The pics might not be real photographs, but most models still have a fair amount of detail. You can also probably find almost any probe, space craft etc there is in the add-on section of the forum.
I hope this helps at all!