EAGLE is the best PCB software package I've used so far, as It's easy to use, simple, and has a wide range of existing libraries. However, one thing that I'd really like to see included in it is some sort of 3D view. This is available on other packages like DIPtrace and Altium designer, but not (that I'm aware of) on EAGLE! Please consider adding this, as it's a really useful feature to visualise your board before production, and it helps in spotting any errors before you send it off!

