I used one of these (
http://www.amiga-hardware.com/showhardware.cgi?HARDID=762 ) with my A3000... No drivers needed, unless you wanted to use third button and/or scroll wheel and such.. Worked like a charm, like any other Amiga mouse..
Couldn´t get it to work through my KVM, though.. It didn´t have mouse emulation, so that might be why it didn´t work, but I don´t know for sure..
