For wire labels, I just bought one of these and it seems to work pretty good, the writing area is a bit small but they work.
http://www.amazon.com/dp/B000BSLQD6/?tag=atomicindus08-20
http://www.amazon.com/dp/B003I7QKUQ/?tag=atomicindus08-20
There is also this one from 3M but it's much more...