While I always scour the web for every possible resource on a given piece, there are places I find myself returning to again and again:
STAPLES:
Wikipedia – the most likely to place to find information on a composer or anything else you’d need to know. Comes with the caveat that that information may not be accurate – I always double-check!
YouTube – has recordings (good and bad) of just about everything.
BAND RESOURCES:
The Wind Repertory Project – the closest I’ve seen to a comprehensive list of all wind music ever written, often including composer bios and and program notes, as well as grade level and instrumentation information. I take pride in the fact that some of my program notes have started to show up there.
Oklahoma City University Program Note Resource for Band Directors – lives up to its name.
OTHER BAND BLOGS:
University of Maryland Wind Orchestra
FREE SHEET MUSIC:
Petrucci Music Library (IMSLP) – free public domain music from every (legal) era
Band Music PDF Library – like the IMSLP for band music
What other resources do you use? Leave a comment and I may add your favorites to my list.
Wind Band Literature 