it depends
what can you do
can you make things that are cool but completely useless or can you make things like giant screen clocks that cna switch between server time and world time
I've done the giant screen clock, I didn't do an brown townog one yet because I suck at trig but I could give it a go
I've also done a small amount of routed networking allowing you to extend range of wireless by routing through a satellite (send to satellite with a header, forwards to actual destination which can interpret the header and know where to respond to - satellites also good for GPS), networked password locks so that even if you get into the system you can't access the password, encrypted filesystems so you can't access
any of the data on the system, automated turtle farms (okay I did this and got it to kind of work but not fully and ended up ragequitting)
I also wrote a bit of custom BIOS allowing you to lock down the systems a bit tighter against stuff like startup disks but making it so you can do that without necessarily being able to brick a computer is kind of a design challenge, and the guys over at the main computercraft site don't exactly like stuff that allows you to brick a computer entirely
Poll