Final version of FreeBSD 6.3 was released.
This release is continuing the development of the 6-STABLE branch and providing some performance and stability enhancements including solving many bugs and new features.
This release will be supported until January 31st, 2010.
To read more details about features and getting the newer version, follow this Link.

FreeBSD 6.0 has been released.
You can download its ISOs from
Here for i386.
You can get more information about another architectures, Here.

OSNews has published a Review by Robert Watson.
You can read about FreeBSD 6 and it's features also some about TrustedBSD, Darwin, etc. in this Review.
If you are a Newbie in *BSD, I think it will waste your time, a little
Read it at OSNews

FreeBSD 5.4 has been released. Many improvements in functionality and stability have been made since the FreeBSD 5.3 release. You can read its features, Here
5.4-RELEASE-i386-disc1.iso (538MB)
5.4-RELEASE-i386-disc2.iso (640MB)

The third Candidate Release of FreeBSD 5.4 is available.
This Candidate provided because of some problems in Large (4-Processor) Systems.
You can read the complete details, Here