Thirded Deck plans in an SF game are like crack to me, I can't get enough. Comes down to all that time playing Traveller way back, I picked up the Kinunir and Broadsword adventures and Traders & Gunboats supplement mainly because they had cool deck plans in them.
The six (?) deckplan sets that SJG put out are fantastic, with grids of hexes on one side and squares on the other; I wish they would put out more.
Speaking of SJG I agree that the line of 'small' books SJG puts out are great; as someone said earlier I'd be more likely to pick up ten of those than the larger books. They use them for smaller Transhuman Space supplements, an NPC book for Traveller, planet books for Traveller, some of the smaller participants in WWII etc - highly useful.
Bob