Sometimes I use a roman checkboard deplyoment which is actually amazingly useful. Too bad its nigh impossible sometimes.

One of my favorite tactics is use Greek elite Phalangites(the yellow ones) in a super wide formation- three deep with defense off, or in a dense formation with defense off. This is useful against big units of phalangites. The first method causes the phalangites to flank their opponent. The second method causes the phalangites to split a enemy phalanx in half after which you take them out of phalanx and watch your men win. This only works against un-elite phalangites through.

No silver shields for you.

Another fun tactic is to use two slingers to isolate a unit between them so which ever way they run, they'll be pelted from behind.