NILFS: a File System to Make SSDs Scream
The 2.6.30 kernel is chock full of next-gen file systems. One such example is NILFS, a new log-structured file system that dramatically improves write performance.
Kristian Van Der Vliet has implemented asynchronous input/output. This has been tested with QEmu, which shows increased performance both due to this and the also new implementation of memory-mapped files. A development build with async I/O is already available.