I always early scout in 2's as the Z in my ZP team. We get reaper rushed pretty often, and I pump speedlings if i even suspect ling/scv/reaper cheese with half my lings at each base where reapers jump up. Ling speed is really crucial, its been a while since I haven't put my first 100 gas into it. Replays would help, although I haven't been able to watch any replays beyond the ones recorded during the current game session :\