Well, Boethia has Goldbrand, which looks like an akaviri katana(no, you can't convert it to Eltonbrand like in Morrowind), Malacath has Volendrung, (which is a cool looking warhammer, but that's about it), Mephala has the Ebony Blade(looks just like goldbrand), and Molag Bal has the Mace of Molag Bal(pretty cool looking, but not a whole lot of damage). And if you're looking for staves, then Sanguine has the sanguine rose, Sheogorath has the Wabbajack(which you have to get. it turns any non-human enemy into a eak creature, like a sheep), and finally, Vaermina has the Skull of corruption.
No, I'm not pulling this from memory(what am I, a nerd?!?!), I got it from the strategy guide.
That should help a little
[Edited by Angus_Young_Jr, 9/18/2008 4:34:06 PM]