Make no mistake about it — Acer came out swinging this week. Between the AspireRevo, its new Timeline series of notebooks and these two all-in-ones, we’re wondering what the company has left in store for the rest of 2009. The latest newcomers to emerge from Acer are the Aspire Z5600 all-in-one PC and the all-white eMachines EZ1600, both of which we’ll describe in detail below.Starting with the former, you’ll find a gorgeous silver chassis, a 24″ multi-touch panel and loads of multimedia capabilities. Designed