Helma 1.7.0 is the current stable version of Helma and was released on February 10, 2010. You can get it from the download page.
See the Helma 1.7.0 Changelog for a list of bugfixes and the major new features and in Helma 1.7.
There may be a 1.7.1 release, if deemed necessary, or it may get skipped in favor of an earlier Helma 1.8 release. See whether there are any bugs or enhancements scheduled to go into a 1.7.1 release.