OK, so I was a little stupid..
I have this Thermaltake Tenor case, kinda like the Tsunami Dream, if you've ever seen that model... has the USB ports on the side of the front bezel - positioned perfectly to lever the dongle in the port if you push it flush against something, destroying both port and dongle.
Annnyway, so I, for some stoned reason, decided to try and fit my new nano receiver into the busted USB port - fried the dongle, now the mouse is useless.. they want a receipt to replace it, didn't have it with me, so bought a new mouse..
Introduce Logitech's new bluetooth mouse (with no dongle supplied) - the VX470.. this thing's pretty cool...
Mine's in black - the blue was a different tone to that of the Acer AspireOne, which it will be connected to, so I went with the ultra-shiney black model - fingerprints for the win - it'll feel just like an iphone lolll.
Not bad for $63 @ JB HiFi.