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Something I sketched in my Electrical Wiring class. Short but sweet.  And very easy,  No electronics needed!!!  Feel free to ask any questions  : D
Wait, you'd need a diode to make my circuit work... Hmmm :|
You only need one relay to make it latching, just connect the NO relay output back to the coil, add a switch in line if you want so you can break the latching. It'll stay on until the power is removed, or you break the feedback.
I suggest you try this circuit. It won't work, unless your supply is twice the voltage rating of your relays.<br><br>A better circuit would use a DPST relay, and then you only need one coil.<br><br>Steve
Yeah you're right, i meant to draw that as a parallel circuit. I was only half-awake when i sketched this. You could also use a DPST relay as stated before. Thanks
Redraw it, and make it useful, instead of useless.<br>;-)

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