Thanks to brave testers in #lighttpd the AIO-support is stabilizing very well and the corruptions that have been reported are fixed now.
Next to bugfixes, I implemented chunk-stealing and doubled the performance of aio for small files (100k) [16MByte/s instead of 9MByte/s].
Download: www.lighttpd.net/download/lighttpd-1.5.0-r1454.tar.gz