It's been a while since the 20070227 snapshot (2 months?) and there have been plenty of fixes and updates. See the release notes here: <ftp://ftp.icarus.com/pub/eda/verilog/snapshots/verilog-20070421.txt>
The source is here: <ftp://ftp.icarus.com/pub/eda/verilog/snapshots/verilog-20070421.tar.gz>
--Steve