So, yesterday I was showing the BSTRhino's "Doom" mod series to my friend, and we came up with a nifty idea of checking out how much zerglings can a dozen of Doom Dragoons stand against. It was damn funny just to watch them 'lings die, but a question emerged: "Which formation is the most effective?". I'll post our results later, but here are the "rules of engagement" for those who want to join the club and verify the best formation:
!)You may place only 12 Doom Dragoons, no more, no less.
@)The "Singularity Charge" upgrade is researched, but no damage/armor/shield upgrades are used.
#)The DDs are issued the "Hold Position" order at the very beginning. No other orders (movement, attack etc.) can be isssued during the test.
$)The stress-test is done in a "constant-flow" system, using triggers: you create 24 zerglings BELOW the DDs, and issue them the Patrol order to a location ABOVE (or BEHIND) the DDs.
%)The zergling-creation trigger is
Preserved, and activated every 2 seconds: no hyper-triggers here.
^)The test lasts until all the DDs are out.
&)The results are displayed as a
Leader Board of Zergling Kills*)Game speed is "Fastest".
And that's it. So far, the testing showed out that the best formation is 2x6 (2 lines of 6 DDs), with over 950 kills, and the worst is 1x12 (a single line of 12 DDs) with about 600 kills. 4x3 and 3x4 are somewhere in-between.
So, c'mon, test it out yourself and post your results!

PS:Another stress-testing showed that 100 DDs placed in circle around a target location with a constant creation of 60 'lings can hold off over
17.000 zerglings =D