I've read a lot of stuff on the web in my efforts to educate myself about the Red One digital cinema camera's new approach to motion picture image capture and its workflow. Below are some of the better resources I've encountered. If I've left off something helpful, let me know in the comments.
RED DISCUSSION FORUMS
The Red company-sponsored site.
Creative Cow Red Forum Mostly oriented around Red post-production workflow.
Cinematography.com Red Forum Lots of skepticism and passionate disagreement about the Red here.
DV Info.net Red Forum Infrequent posting; lots of overlap with reduser.
Redhax.net: a wiki for Red users. Very incomplete, but useful in spots.
Wikipedia:Red Digital Camera Company entry
Octamas.com: Red One user menu guides
FresHDV: "All Things Red" - another links listing
Creative Cow: Dress for Success with RED
Creative Cow: Shooting with RED: Testing, testing...
ProLost: Exposing to the Left vs. Exposing to the Right
Pro Lost: Digital Cinema Dynamic Range -- an epic post
Reduser.net: Thread on Working with RAW
Bealecorner: John Beale's camera tests
American Cinema Editors: Podcast discussion for A.C.E. members about the workflow for Red with Avid and Final Cut Pro.
RedHax Wiki: Footage Protocol on Set
RedHax Wiki: Footage Conversion
Editors Lounge: Handling Red One in Post-Production [link to page with pdf file]
DV Magazine: Posting RED
Scott Simmons' Editblog: posts tagged "red"
Pro8mm: Red & Super-8 Telecine (!)
ONLINE TUTORIAL/DEMO VIDEOS
Wonderhowto: Learn All About the Red One Camera - 12 videos!
Studio Daily: Shooting Red
Studio Daily: What You Can Do with Red Alert
Studio Daily: Final Cut Pro - Red Workflow
Studio Daily: Edit RED Footage in Avid Media Composer
Studio Daily: RED / Avid Workflow
Studio Daily: Maintaining Red Metadata to Avid
Studio Daily: Assimilate Scratch / Red Workflow
Official REDCINE Training Videos
Red Relay Repository of Red One footage.
RedCentre @ FX Guide Weekly podcast on all things Red from FXGuide.
RED 3rd-PARTY SOFTWARE
Crimson Workflow FCP round tripping application.
RedTrip Essentially an early, free version of Crimson Workflow.
Red Portal Allows you to double-click R3D files to open in RedAlert!
AliasRDC Helps with footage conversion (see http://www.redhax.net/wiki/Footage_Conversion).
MetaCheater Allows MetaData use in Avid.
Spotlight Plugin for R3D Files Lets you easily find and identify r3d-files on your computer.
3rd PARTY ACCESSORIES
Some might ask why this site is posting about Red, considering it is, for many readers, a high-ticket item (especially when you add in the cost of lenses, support, etc.). My answer is that this is a site that's devoted to all forms of maverick filmmaking, including the invention of maverick filmmaking tools. By this standard, Red certainly qualifies.