I uploaded 0.3.8.1 for Linux with re-built 64-bit. I ran a difficulty 1 test with it and it has generated blocks.
http://bitcointalk.org/index.php?topic=765.0
Download:
http://sourceforge.net/projects/bitcoin/files/Bitcoin/bitcoin-0.3.8/bitcoin-0.3.8.1-linux.tar.gz/download
Post #0334