Acer's Aspire One has been somewhat overlooked in the face of a relentless barrage of Eee PCs and other netbooks, but slow and steady tends to win the race -- Acer says it's on track to ship six million machines this year, which is ahead of ASUS's target of five million Eees. Acer's mostly pulled into the lead due to its size and ability to push the Aspire One globally, while ASUS (which less than half the revenue) has been building the Eee market by market. Of course, that doesn't mean ASUS is going down without a fight -- we've already seen some aggressive ads, and Acer doesn't have anything to match machines like the S101. Looks like the netbook market is starting to get heated -- it'll be interesting to see how this all shakes out over the next few months.