Twilight Imperium is a game that has a TON of rules that are well laid out in the rulebook, but not accessible quickly for players. I have found a lot of useful quick reference sheets on www.boardgamegeek.com and have just created an artscow deck for the Leaders Variant.
Leader Card Artscow Album: http://www.artscow.com/ShareAlbum.aspx?Key=ime9t1y9
I have put together a deck that includes 7 copies of each of the Leaders cards as well as the custom Pirate Characters for Merchants and Marauders (Created by pere cobo (alonsi)) and the Terrors in the Deep Variant (Created by Scott Lewis).
Artscow 54 Card Deck: http://www.artscow.com/gallery/card/ti3-leaders-and-hxm38oyznnyx
HOW TO PRINT AN ARTSCOW DECK