MIDIs, Sheet Music, and Software

Brass World
This site is devoted to performing resources for brass players. Sheet music, charts, transcriptions, lead sheets, and teaching aids like fingering charts are all available here. Brass categories are broken into trumpet, horn, trombone, tuba and ensemble. Adobe Acrobat Reader required.

TrumpetStudio.com
This site offers a number of MIDIs that require Quick Time to play, along with simple lessons on playing and performance. There are also scale charts, lists of recommended books, and a humor page devoted to trumpet jokes.