The section on propulsion didn't mention a few very promising things.
It quoted S.Borowski, but not the bi/tri-modal nuclear thermal: adds LOX into the exhaust bell for extra thrust/lower isp for short duration needs like perigee kicks or take-offs, and switches to electric generation for high isp/low thrust nuclear powered electric on the long haul. This trimodal NTR achieves everything VASIMR does, with presently understood engineering.
http://www.nss.org/settlement/moon/LANTR.html
TRITON: A TRImodal capable, Thrust Optimized, Nuclear Propulsion and Power System for Advanced Space Missions
http://www.aiaa.org/content.cfm?pageid=406&gTable=Paper&gID=19430

It mentioned fusion and antimatter, but lacked any mention of EPPP / Nuclear Pulse rockets (particularly the magnetic sail/Orion hybrid which is the sort discarded for consideration of interstellar travel, but with hundreds of km/sec delta-V, opens up the entire solar system).
http://www.angelfire.com/stars2/projectorion/EPPP.html

General Atomics, Nuclear Pulse Space Vehicle Study, Volume III -- Conceptual Vehicle Designs And Operational Systems, September 19, 1964
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19770085619_1977085619.pdf

Nothing specifically about the the near-er term ACMF.
http://www.engr.psu.edu/antimatter/introduction2.html http://en.wikipedia.org/wiki/Antimatter_catalyzed_nuclear_pulse_propulsion

Long term, unless VASIMR becomes very cheap, nuke pulse seems to be the way to go, for in-space-only use interplanetary trips.

I wouldn't expect the larger nuclear powererd proposals to get off the drawing board or even into serious consideration in the present climate (including VASIMR, in its larger forms). In the future, if we're testing the waters and need a real ship to explore space, I can't forget how Dyson said that only Orion shows promise for dealing with the true scale of the solar system.