Download the Nikon D90 operator's manual:

http://www.nikonusa.com/pdf/manuals/noprint/D90_ennoprint.pdf

Please reply with links to other HD-enabled digicam operator's
manuals that you're aware of (except for the Canon EOS 5D Mk. II (http://www.dvinfo.net/conf/canon-eos-5d-mk-ii-hd/),
since we've already got it covered) -- thanks in advance,

http://exilim.casio.com/resource/pdf/manuals/EX-F1.pdf

Canon EOS Rebel T1i/500D Downloads/Guides/Manual Page:

Canon EOS Digital Rebel T1i (http://www.usa.canon.com/consumer/controller?act=ModelInfoAct&fcategoryid=139&modelid=18385#DownloadDetailAct)

Canon EOS Rebel T1i/500D Instruction/Owners Manual

http://gdlp01.c-wss.com/gds/7/0300002157/01/eosrti-eos500d-im-en.pdf

http://www.pentaximaging.com/pdf/K-7_e_web.pdf

US / NTSC
http://service.us.panasonic.com/OPERMANPDF/DMCGH1.PDF

AUS/PAL
DMC-GH1-K, 12MP LUMIX-G Digital Interchangeable Lens Camera [DMC-GH1-K] - Panasonic Australia (http://www.panasonic.com.au/products/details.cfm?productID=7279)

http://www.pentaximaging.com/images/temp/63393966013171180515487Manual_K-x_EN.pdf