I'm planning on controlling some external circuits using the parallel port by switching on relays that can switch on the external circuits.

Am I right in thinking the pins have a voltage of 3-5V when high and a maximum current of 50mA? The most sensitive relays I can find require 5V and 1A (eg, <http://www.maplin.co.uk/dpdt-1a-miniature-relay-37494>)