In all honesty, my interest is in software. But if you want to run software, you need some hardware, too.
A number of these HW-projects are from Byte Magazine's "Circuit Cellar" column, others were found thru ads in various Magazines. Today, there is a Circuit Cellar web site, centering around embedded computing.
One thing which I did enjoy was to slightly modify some of the hardware kits I assembled, because it increased my insight into the respective design or implementation.