iPod nano : Page 4

On this page the folks at Ars Technica took apart an iPod nano 2GB after making it go through a series of "stress tests". Notable components: scroll wheel controller by Cypress, codec by Wolfson, media processor by Portal Player, and SDRAM by Samsung, power management by Phillips, and flash by Toshiba.

Portable HD media player

This product uses a chip made by Sigma Designs.

Sigma Designs, Inc.

Sigma Designs, Inc. have lots of chips for "Digital Media Processing For Consumer Appliances". Their products are used in some portable-HD based media player / PVR products.

MercuryNews.com | 09/17/2005 | Low-power chip packs fistful of video images

This article from Mercury News talked about another startup called Mobilygen making low-power H.264 chips. Probably a decoder. Here is their company's website. Here is an EETimes article that contains a little bit more technical details.