what strategies do ya'll use when playing online?

Rushing is awesome.
Only used for the Experts

Rush and hold, bag and tag

Basicly.. build up your forces while defending. Make a very strong defencsive line and hold it, when you have a number of preferd upgrades such as units and such, you move your line forward slowly and together, all the while claiming all the territory and points.

Works great against a comp, vs a human.. not so well because its biggest draw back is that most if not all your units are on the defence line and if they jump over it, they have a clear line to your base.

Rushing is very good against a newer type player, but for somone that has played it would be a death trap as it would be expected. Not to mention with a rush you do not have the powerful units able to destroy the line.

i sneek in with scouts and drop dreadnoughts on them.
they go down quick.

i just swarm them with deep striking flayed ones