My transcriptions:

• "Sanctuary" (Wayne Shorter): lead sheet
• "Sanctuary" (Wayne Shorter): Ron Carter's bass part (with notation of George Benson and Herbie Hancock's parts as well) on the head of Wayne Shorter's Sanctuary, from Miles Davis' Circle in the Round
• Chet Baker's solo on "Summertime", from the Last Great Concert (NB this is a much more accurate version than the one available here)
• Nick Payton's solo on "Chameleon", from the album Fingerpainting

Links to other free sheet music sites:

• Great classical sheet music for brass
• Some good Canadian jazz content
• An unbelievable number of free pieces in PDF form
• Jazz Trumpet Solos
• Lead sheets & solos, all posted as image files
• Decent Collection of jazz trumpet transcriptions
• A vast archive of American music from 1820 - 1885
• Lucas Pickford's Impressive collection of (generally accurate) transcriptions