A somewhat interesting article about which nameless company is the one actually manufacturing these netbooks. According to a Digitimes article:
Currently, Quanta Computer manufactures Acer’s Aspire one, Compal Electronics is doing Dell’s E series products, Inventec is making Hewlett-Packard’s (HP’s) Mini-Note PC, and Pegatron Technology makes Asustek’s Eee PCs.
The article also mentions that Wistron is the only major manufacturer not currently signed to make netbooks, although it claims it is actively involved in negotiations to do so.