It's the same level of support as Netscape 4.x, with the exception that it doesn't support searches. This assumes bryner doesn't change the Necko APIs on him, of course. This is the W3C's markup language for mathematical content, and has been maturing for a while now. It's already turned on on the tinderbox builds. A company called Design Science owns some suitable ones which they are willing to contribute.
Negotiations are in progress, with a few loose ends to tie up.
Nice one, dougt. LDAP Autocomplete LDAP support is one of Mozilla's most requested features. The first thing that is happening is autocomplete support tied into the Address Book, so you can query and LDAP server for matches for what you type in a Mail Compose window, for example. There's nothing to try out yet, but there should be next week - autocomplete is taking its first baby steps. They are targetting 0.9 for auto-complete of email addresses from an LDAP server.