From a casual glance at SJG's listing, done by a non-Gurps acolyte (whatever that means):
2003
June - Humanati
September - Starships
2004
February - Sword Worlds
April - Star Mercs & Far Trader reprints
upcoming:
June - Nobles
at some point Interstellar Wars
And you can purchase the Far Future reprints from SJG's Warehouse 23. For that matter also the BITS books.
Offhand I haven't noticed any updates to Grip or additional modules to it since around T20's release and Grip is done by the QLI/T20 folk.
And considering the rate at which QLI is producing pdf TA's and Epics let alone print products I wouldn't exactly use the term churning out products.
Three print products in total. And that's including Gateway which until I get a copy in my hands doesn't really count to me.
JTAS seems to be going as strong as ever discussion post wise from I can tell. A high signal to noise ratio which isn't the case lately on CotI. There might a slight dip in the number of articles but I've found them in general useful and I don't play GT.
/me shrugs
Choice is good. And fwiw the TML is hosted by QLI here on this site and while it has its share of Gurps players, most of the discussion is system independant / adaptable. Just like Gateway.
Casey (puts cluebat down ^_^)