I have experimented with installing gdal 1.9.1 via homebrew. It works wonderfully. Unfortunately, their is no real JP2000 support. I realize that JP2000 is supported by OpenJp2000, but that implementation is buggy to say the least.
Using the KyangChaos gdal installer I am able to add ECW support quite easily. Has anyone been able to get ECW support for a homebrew installation of GDAL? The default in the forumla is to build '--without-ecw'. I am brand new to homebrew and not quite sure how to even begin to gain some better JP2k support.