P.S.: Among the year's many reissues, I would recommend Stan Getz & Kenny Barron, People Time: The Complete Recordings (Sunnyside); Miles Davis, Bitches Brew: The 40th Anniversary Collectors' Edition (Sony); and Henry Threadgill, The Complete Novus / Columbia Recordings (Mosaic).
P.P.S.: My list from last year of 2009's Best Jazz Albums would have included, high up, two staggeringly good, modern big-band albums, except that I'd neglected to hear them in time—Darcy James Argue & The Secret Society's Infernal Machines (New Amsterdam) and John Hollenbeck's Large Ensemble's Eternal Interlude (Sunnyside).
Correction, Dec. 16, 2010: This article mistakenly referred to Conlon Nancarrow as "Colin Nancarrow." (Return to the corrected sentence.)