Anandtech posted a story that TRIM Enabler 2.0 for OS X Lion has been released

People are often concerned with the performance of their SSD; is it running as fast as advertised. TRIM is an essential part of keeping your SSD performance up (see this article for details) and it has been very beneficial for Windows 7 users. However, for Mac users, TRIM is only available if you purchase an SSD straight from Apple when buying your Mac. The actual TRIM command is supported by OS X, so with minor kext modifications, it’s possible to enable TRIM on non-Apple SSDs as well. Terminal is needed for this and although it’s simply a matter of copying and pasting the commands, not all users are comfortable with using Terminal at all.

  TRIM Enabler 2.0 for OS X Lion Released