Not a question I run across a lot, but I do run across it from time to time: What browser can I use with SharePoint?
This link is about a year old and based around betas, but it at least gives a rough indication as to which browsers you can/cannot expect a reasonable experience with.
Thanks to Chris Randall for bringing this to the attention of readers of an MCT newsgroup.
However, as always, mileage may vary.
If anyone has a more current/up-to-date link, let me know and I will happily update this post.