The EeePC 1000H system does have slight edge over the Lenovo S10 system in terms memory bandwidth, while at the same time delivering lower latencies. In all likelihood, the delta isn't large enough to show any real world performance differences, although obviously better memory performance is always preferred.
We do see a pretty massive performance difference in terms of disk performance, at least in this synthetic test, between the two netbook's storage subsystems. Lenovo's choice to use the WD Scorpio notebook hard drive pays off, delivering 51 MB/s sustained throughput rates, definitely solid for a 5,400 RPM disk drive. The EeePC 1000H runs at a respectable 38 MB/s with its Seagate Momentus 5400.3 drive.
Despite having a faster disk, the IdeaPad S10 altogether is just a bit slower than Asus's EeePC in performance testing with PCMark05. The EeePC can clock itself up slightly when plugged into a wall outlet (which our test systems were), which seems as the likely cause for improvement of one system over the other.