Derelict Starships is one of those supplements which would prove useful for a variety of roleplaying systems; GURPS, D20, Traveler, etc. It's generic enough that it shouldn't throw any wrenches into an existing campaign (even relatively low tech space exploration), but specific enough to space flight that it doesn't seem like a rehashed fantasy set of snippets.
The book is moderately sprinkled with artwork which is above the average fair for indie publishing, and features an easy to read typeface. The final pages of the book also come with flash cards for quick (and random) descriptions of any situation should you need it. Very handy; though it would be best printed on card stock instead of plain paper.
Sections are broken up cleanly into separate sections of a standard of a ship, including: Hatches, Corridors, Bridges, Crew Cabins
Finally, the random blurbs for each section are potentially suitable to a mild rewrite to work for space stations (which I shall be doing tomorrow for my own gamaing session!), orbitals, or (which I just realized), exoplanetary colonies. There are even a few traps!
All in all, aside from being a little short for the price, it's a worthwhile product. Considering its the only one available (as of Oct 8th, 2009) for space settings, its pretty much a must have for the regular GM.
[4 of 5 Stars!]