Today, I've found and fixed a serious bug in VB.NET version 0.9.1589.25172 which prevented the checksum verifying function from working. The new revision, 0.9.1589.32767, is on CVS and download page. If you have VB.NET version of HashSum, I seriously encourage you to update.
http://hashsum.sourceforge.net is the URL of the first HashSum's home page. It's incomplete and under heavy development, so please be patient.
For now, i've completed the first release set for HashSum: all .NET languages plus Java. Now, i'm trying to get it working in native C++. It could take a while, so bug reports on the already posted versions will be welcome.
Finally, HashSum is feature-complete and stable enough to publish a release! This is my personal programming record (2 days) for a .NET application. It's the first application I publish for general public use, so please be patient with me about bugs and feature requests. :D