I'm currently using Safari 1.1.1 under Panther. I had to download from a discussion group a Zip archive made with the "Create Archive" feature in Panther. Safari automatically decompresses files upon download, but when I opened the unzipped folder, the '__MACOSX' folder was present, and the resource forks for the files (in my case, some Type1 fonts) were not restored.
While we wait for Apple to update Safari and fix this, there is a workaround. After Safari unzips the archive, it puts the original archive in the trash. Simply drag this original archive out of the trash and decompress the archive through the Finder.
[robg adds: I haven't seen this issue, but I don't use Safari much, and do very little with resource fork files any more. If someone can confirm/deny this one in the commnets, I'd appreciate it...]
Mac OS X Hints
http://hints.macworld.com/article.php?story=20040125185446852