SlayerS was and still is led by The Emperor, BoxeR, himself. Along with other Terran players like MMA, Ryung, Ganzi and Taeja, SlayerS arguably had the strongest Terran line up in SC2. However, things have changed since early 2012.
It is common to open with one barrack expand without taking gas against Zerg.
The standard metagame before and after the 126.96.36.199 patch is reactor hellion after getting a quick command centre. This opening branches out to various of strategies. There was a period of time when cloaked banshee is the popular follow up. However, after the 188.8.131.52 patch, this may change.