WinZmanim is no longer supported. I use Linux as my primary operating system, and it seems that lately even finding a bug in WinZmanim (and there are surely several) hasn't been enough motivation to boot into Windows to fix it.
please help me by testing daylight savings time handling in any version. if you find problems, email me firstname.lastname@example.org
(I already intend to fix the problem where if "Today" is the first day of Daylight/Standard Time, "Yesterday"'s times will be wrong)
Zmanim now has a sourceforge project. I've already written the software, and I plan to upload it to sourceforge.net sometime before January 6th, 2003.