I think I'm going to add SOCKS proxy support to mozilla. It looks quite easy, and I think I can support all network protocols at once (ie. HTTP, NNTP, IMAP, POP, finger, etc), which is an improvement over the 4.x SOCKS support.
New HTML Parser: The long-awaited libxml2 based HTML parser code is live. It needs further work but already handles most markup better than the original parser.
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If you're a C programmer with some spare time, take a look at the mod_virgule project page and help us with one of the tasks on the ToDo list!