Jeff Jonas has an article on using war machines in Warhammer Ancient Battles. There are some nice pictures of painted Roman war machine models, and a good discussion of their use by the legions.
romans
Late Roman Lion Rampant Variant
The I Live With Cats Blog has a variant for Lion Rampant featuring Late Romans.
Early Imperial Roman Photos
Eye candy time. Here are some pictures of really well-done Early Imperial Romans. I like to have pictures like these to use as a painting guide.
Caesar’s Commentaries
Among his other talents, Julius Caesar also was a very good writer. The “Commentaries” on the Gallic and Civil Wars are classics of military literature, providing a unique insight into Caesar’s military campaigns. While it is true that there is an element of propaganda here, remember that history always is written by the victors. You can get the Commentaries in a free etext version here.