Sometimes when entering a search term in the address bar the "instant search" goes a little crazy and loses half of the text I typed in. Not a big deal, but happens once in a while.
I can certainly look at offering a privately-hostable version eventually. It's running on a typical asp.net stack, so shouldn't be too hard to install elsewhere.
I'm currently focused on getting the public service out there, but if you're keen to get Jooplicate running locally please drop me an email andrew@equin.co.uk . It would be useful to know what kind of requirements you have.
Does this help with buzz updates? It bothers me that if I read buzz updates in gmail that they are still unread in google reader's "friends you follow" and vice versa.