I am yet to try it, am downloading for the first time as I write, however, just released:
http://www.rev-ed.co.uk/picaxe/ -> Software
AXEpad installation instructions, all versions
AXE027 USB cable instructions (drivers are below)
MacAXEpad (Mac OSX, Intel)
MacAXEpadPPC (Mac OSX, PPC)
LinAXEpad (Linux, x386 with GTK2.8+)
WinAXEpad (Windows 2000, XP, Vista)