T.Jackson - Sure there are, I've had several already

While I still have trouble with some electrical principles, I'm actually a fairly safe person around higher voltages (now - I learned my lessons young)

The projector controller I've been playing with has unmarked hot areas - and I didn't even make it.

I originally looked at the current transformers because they were contact less, I'd just have to wrap a couple of active windings around it to measure load - however, I've only found one place here to buy them, and they don't carry any of the other components I want - so to buy 2 it costs me $20, most of that shipping.

Acetronics - I'm afraid that's not what I'm after, I have 2 of what I think they are already. My aim is to sense whether a device is powered up, or in standby/off. I can already do it via hardware hacks (looking for 1.1v on composite out, physically altering my amp, etc) but I'd like to build a more generic method.

The ACS712 is a really nice chip - absolute no brainer to use, plenty of isolation - http://www.farnell.com/datasheets/94750.pdf - it's just getting them, while they are available from my preferred stockist they're still so expensive here.

Maybe it's worth getting ACS712's so that I can be better isolated and not have to deal with it.