Enable TRIM support for 3rd Party SSDs. Works for Mountain Lion.

enable_trim.sh

#!/bin/bash
#
# Enable TRIM support for 3rd Party SSDs. Works for Mountain Lion
#
# Source: http://digitaldj.net/2011/07/21/trim-enabler-for-lion/

set -e
set -x

# Back up the file we're patching
sudo cp \
  /System/Library/Extensions/IOAHCIFamily.kext/Contents/PlugIns/IOAHCIBlockStorage.kext/Contents/MacOS/IOAHCIBlockStorage \
  /System/Library/Extensions/IOAHCIFamily.kext/Contents/PlugIns/IOAHCIBlockStorage.kext/Contents/MacOS/IOAHCIBlockStorage.original

# Patch the file to enable TRIM support
sudo perl -pi -e 's|(\x52\x6F\x74\x61\x74\x69\x6F\x6E\x61\x6C\x00{1,20})[^\x00]{9}(\x00{1,20}\x51)|$1\x00\x00\x00\x00\x00\x00\x00\x00\x00$2|sg' \
  /System/Library/Extensions/IOAHCIFamily.kext/Contents/PlugIns/IOAHCIBlockStorage.kext/Contents/MacOS/IOAHCIBlockStorage

# Force a reboot of the system's kernel extension cache
sudo touch /System/Library/Extensions/

echo "Now reboot!"

Doesn't work on 10.8.2 Mountain Lion because this checks the whole string before the APPLE SSD to be nulled and the first character of the string after. In 10.8.2 the string after no longer is "Queue Depth", an additional SSD marker string "APPLE SSD TS" has been inserted so the first character after is "A" (\x41).

See my fork for a fix.