A new entry was posted on the Engineering Windows 7 blog, it details several of the optimizations Microsoft has made in Windows 7 to improve support of solid state disks.
There's support for the Trim command and several changes to the default behavior of the drive. You can check it out over here, below is a brief snip:
Windows 7 will disable disk defragmentation on SSD system drives. Because SSDs perform extremely well on random read operations, defragmenting files isn