If you want to help, compile clamav with:
./configure --enable-debug
and enable Foreground option in clamav.conf.

Known bugs:
-----------

-) clamd crashes with Zip/Gzip files under FreeBSD (5.0-CURRENT tested)
   and OpenBSD
-) Clamuko/Dazuko - ON_CLOSE scanning doesn't work
-) unrarlib doesn't work on 64-bit systems
-) buffer overrun in vfprintf when using "clamscan --help" on SCO Unix 3.2v4.2
   (problem found by Nigel Horne)