I found ClipX a few years ago and have used it every day since. The ability to have a searchable history of copied text and images from a hot key (I use ctrl+shift+z) has been invaluable. It’s saved me a lot of time where I can just search for something I copied earlier in the day or even yesterday. It hasn’t been updated since 2008, but still works on my Windows 7 machine.
Visual Studio has this with ctrl+shift+v, but I like to have this anywhere in Windows.
I’d be open to a newer piece of software, but for now I’m sticking with what I know.