First, traditional hard drives: TechARP has comprehensive coverage of Seagate's 2006 Technology Briefing. Eleven new and updated products are detailed, including Seagate's first hybrid (flash + magnetic platter) hard drive, a 2.5" drive designed for the desktop market, and an 8GB version of the Pocket Drive (SPCR Review). Samsung's version of this drive was mentioned in our WinHEC 2006 report.
If traditional HDDs aren't quiet enough for you, The Tech Report has a thorough review of the Super Talent 8GB (the one used in the Puget Sound PC SPCR reviewed in June): Super fast random access times but dead slow transfer rates.
Need something a bit faster? Freescale Semiconductor has announced the first commercially available magnetoresistive random access memory (MRAM). Promising better speed and longevity than flash memory at competitive prices, and completely silent operation, this might be an interesting alternative if and when it's offered in a PC-usable form factor.