nVidia is building low-cost PC platforms to compete with Intel. Basically it is a mobo with a processor and GPU built-in (the CPU is from VIA). The cost is below 45 dollars and supposedly about 6 times faster than the equivalent intel offering. http://www.news.com/8301-10784_3-9917348-7.html Sounds awesome for HTPC to me!
45 dollars for basic-ish mobo, processor, and onboard graphics. All the rest (memory, drives, case, etc) would be extra.