Conclusion

Developed a detection framework to find hidden messages on the Internet:
Stegdetect automatically detects steganographic content.
Crawl is an efficient web crawler that saves JPEG images.
Stegbreak mounts dictionary attacks against images.
Disconcert is a distributed computing framework that assigns jobs to a cluster of workstations.

Software available under BSD-license:
http://www.citi.umich.edu/u/provos/
Disconcert not released yet.

Outguess 0.2 is undetectable by these techniques:
http://www.outguess.org/