BenGunn said:
Aslan make nice stand ins for Kzinhi, Chaanur(sp?), Samurais and enigmatic former Commanding Generals of parasitic aliens
Chanur, and that was a clan name, not the race name - the race went by the name "Hani", after their governing council, the Han.
Which leads to the thought of importing the Mahendo'sat from that universe; one could either leave them as a true alien race looking rather like Terrestrial apes, or glean what cultural information one can from the Chanursaga and turn them into a human minor race. Ditto the Kif and the Shsto. Regrettably, there's not really enough information on the methane-breathing races (Tca-Chi and Knnn) to be usefully portable to Traveller.
BenGunn said:
The K'Kree are a nice stand-in for the Posleen and similar "a lot but stupid" races
No, I wouldn't use the K'kree as a stand-in for the Posleen; the sociology is completely wrong. I always describe the Posleen to a Traveller fan unfamiliar with them (Posleen) as "The K'kree's worst nightmare", and elaborate on why.
Other aliens I think could be interestingly applied to Traveller:
Jacqueline Lichtenberg: Dushau Trilogy - the Dushau, especially, but some of the other races that Krinata encounters - such as the Holot - could be interesting as well.
An interesting symbiotic pair of human-mutant minor races can be found in the Sime~Gen universe by Jacqueline Lichtenberg and Jean Lorrah.
Vernor Vinge, A Fire Upon The Deep: the Tines, obviously. From his A Deepness In The Sky, the human Emergency society could provide some interesting possibilities for Traveller, and the Spiders would make for interesting aliens.
The Race, from Harry Turtledove's WorldWar/Colonization series is too easily mapped to badly-played Bwaps or Vilani.
I'll give you the Darhel-as-Hivers, but the basic motivations for their respective manipulativity is different. I think that a Traveller universe could have room for both, and for the Indowy and Himmit as well.
While some of the aliens from the Pocket Books Star Trek novels are interesting as presented, I'd say that all of them are presented with insufficient depth to be able to use in a rich game like Traveller. This is sad with respect to the Vinithi (Sackers) from "The Three Minute Universe" and the Sivaoans and their cousins the Eeiauoans from "Uhura's Song". On the other hand, the three most important non-human races from the original TV series have been well-developed in novels; Diane Duane did quite impressive jobs on the Vulcans (Spock's World) and the Romulans (The Romulan Way), and John M. Ford was equally impressive with the Klingons (The Final Reflection). Any or all of them could be imported into Traveller as human minor races.
A couple of lesser possibilities might be the Fuzzies (H. Beam Piper) and the Treecats (Honor Harrington series by David Weber).