It's done everyday, but (as they say) you never forget your first. The 'cube' above is Satellite A0-91. This little guy has a VHF/UHF amateur radio repeater on board which means it is available for use if you hold a FCC Technician license.
It's not overly difficult, but it is a good challenge. Today we were able to get a contact for the first time. It's pretty satisfying using a $50'ish handheld radio to communicate via space.
Here is the audio: