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I've got a nice 40x4 LCD that is LED back lit. I'm not even going to try to run it off a 7805 unless i can find something much lower than 12V as the input voltage.
I/we should hunt down a decent sized power resister and run it inline with the 7805 in all honesty.
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Take this lm317
http://www.national.com/mpf/LM/LM317.html
adjust the output to some reasonable value- 8 volts maybe?
feed that to the 5 volt regulator.. Or maybe just use the lm317 as a 5 volt regulator?
Don't forget the heatsink.