My vote for one of the most innovative and best interfaces ever - the Ocarina app for the iPhone
http://ocarina.smule.com/
http://www.cattail.nu/iphone/ocarina.smule/
http://www.youtube.com/watch?v=eg-LWM8U1YU
Project web pages from top HCI programs around the US
Carnegie Mellon:
http://www.hcii.cmu.edu/Research/projects.html
http://www.etc.cmu.edu/projects/currentprojects.php
http://www.etc.cmu.edu/projects/projectgallery.html
http://www.cs.cmu.edu/~johnny/projects/wii/
Stanford:
http://hci.stanford.edu/research/index.html#currentprojects
MIT:
http://www.media.mit.edu/
http://www.media.mit.edu/?page_id=110
http://web.media.mit.edu/~dmerrill/siftables.html
http://www.ted.com/talks/david_merrill_demos_siftables_the_smart_blocks.html
University of Maryland:
http://www.cs.umd.edu/hcil/research/project-highlights.shtml
http://www.cs.umd.edu/hcil/pubs/video-reports.shtml
HCI sites from professional organizations
http://hcibib.org/
http://hcibib.org/tcuid/
ACM Special Interest Group on Computer-Human Interaction:
http://sigchi.org/
Design critique and ergonomics
AskTog:
http://www.asktog.com/menus/designMenu.html
Nooface - beyond the PC interface:
http://nooface.net/
Exemplary interaction design studios
http://maidmarian.com/
http://maidmarian.com/SherwoodLanding.htm
Computer vision-based games
http://www.playdocam.com/
http://www.playdojam.com/
Miscellaneous novel interfaces
Multi-touch screen:
http://touchkit.nortd.com/
Sensor, transducer, and actuator project:
http://www.sunspotworld.com/
Tactile interface for the blind:
http://www.nist.gov/public_affairs/factsheet/visualdisplay.htm