In addition to the above...
Paths of Disharmony
mentions the icy Delta Vega.
Zero Sum Game
mentions that beaming 3 people from two targets onto one pad has been "done before"
In addition to the Red Matter, DTI: Watching the Clock
also goes into some (purely theoretical, since they shouldn't know about it) detail about black holes and branching timelines.
I haven't read it myself yet, but I think Rings of Time
mentions Uhura having had an Orion roommate at the academy.
I love spotting nuTrek references in Prime-verse novels. It makes me feel all warm and fuzzy.