Very high on my list would be a Robot design system (Flynn, do you read
this ?

).
Otherwise my technology needs are well covered by the Central Supply
Catalog and Audace ad Gloriam, although an improved version of the ve-
hicle design system would also be welcome - right now I am using CORPS
or GURPS for vehicles.
I would also be very interested in a Mongoose Traveller versions of a World
Builder's Handbook, with good ideas for a world's society and culture as
well as its physical stats, and something like Pocket Empires, a kind of
Runequest Empires for Traveller that makes it possible to design and play
an entire state, both as a background for a campaign and as a separate
"mini game within the game", like the trade system.
And I am of course looking forward to Merchant Prince and hoping for a
good supplement on diplomacy and politics, too.