NOLA.com, the Times-Picayune's outstanding website.
Network for Good's Hurricane Relief page.
Instapundit's ongoing list of Katrina-related charities.
The Truth Laid Bear's Blog for Relief Page, where you can log your contributions and recommend charities.
The Interdictor, a guy who's been keeping his Internet company up and running in downtown New Orleans throughout the entire storm and post-flooding madness. He's also running a streaming webcam, with a view of what appears to be St. Charles Avenue in the CBD.
Auryn, a nurse who lives in LaPlace and rode out Katrina at her hospital in New Orleans.
CobaltGreen, a TV producer and filmmaker who's lived in New Orleans for the past five years.
Brendan Loy, a second-year law student at Notre Dame.
New Orleans MetroBlog, a group blog.
Eyes on Katrina, by the Biloxi Sun-Herald.
Kaye Trammel's Hurricane Update, by an LSU professor.
Josh Britton, a student at LSU.
GulfSails, by a guy in the River Ridge area just west of New Orleans (ZIP code 70123).
Ernie the Attorney, by a New Orleans lawyer.
Katrinacane, a Live Journal group blog.
Interactive Katrina Information Map that allows users to add informative updates to a Google map of the Gulf Coast.
PRNewswire's Roundup of Katrina blogs, articles and related sites (which tipped me off to most of the blogs above.)
Alex Hessler's New Orleans flood damage map, which he created from a range of sources.
NY Times' interactive map of New Orleans.
Cultural South Update, from the American Association of Museums.a
Greater New Orleans Community Data Center, with extensive maps and demographic information on Orleans and surrounding parishes.
NOAA's entire post-Katrina Gulf Coast photo index, including the New Orleans photo index. Most detailed shots I've seen, but it's a little tough getting oriented, because the photos haven't been rotated to correspond with the map.
Here's the eastern half of the French Quarter, and part of Faubourg Marigny. (The circular-patterned park at the top is Jackson Square.)
Here's the Superdome.