Ideas For Auto Updating Application

Question

No code necessary, but Im just curious about how some of you do updates for applications. I have an application with a few linked libraries that I am attempting to build a TCP/IP update application for to replace those libraries with more recent ones based on their version numbers.

This is a pretty annoying prospect when you cant replace some of them while the application is running.

How do you guys do updates for applications without using ClickOnce? Any ideas? Thanks :)