Ok here goes - AWA tips from a 6 pointer (thank u, thank u !

)
Alrite to start off.. I wud stress on what Abdul has already written - LENGTH. write as much as u can ..if u have stuff to write - DO NOT HOLD URSELF BACK. There is no word limit for the GMAT AWA.
And making Grammatical Mistakes is not a crime.. but make sure that the mistakes are not too many . The machine grader wud obv pick out spelling mistakes etc , so make sure u READ THRU ur essay at least once after you are done.
And as already mentioned ...make sure ur essay has a proper Structure.. Basically just use the one's mentioned in Princeton Review or something..They can 'fit in' into any essay ! and trust me... they do help!
Thats all from my side..
and btw .. don't worry if u were not able to click on Submit coz the time ran out..coz whatever u have written is stored (happened to me ! ) - BTW the last point is something that shudn't happen coz it basically shows bad time management!