AVR-Chat

I am trying to design a PCB for an ATmega128.  I probably will use 
an Olimex header board on top my my PCB.

I want to supply good 5v to the header board and the rest of my 
project.  I plan on using some LM7805 type of device, but since it 
will be supplying everything, including the back lights of the LCD 
displays which are surprisingly rated at several hundred milliamps 
EACH, the supply will have to be rated at 1.5 amps to be sure that 
everything is covered plus insurance.

I will eventually be drawing 13.x volts from a potentially fairly 
noisy car power source.  The supply needs reasonably good 
filtering.  I want good filtering without overkill.

What filtering is necessary?  I assume a pretty big electrolytic on 
the 13v side ( and maybe a tantalum or something?), and something 
else on the other side.  On the output side I have seen 2 caps on 
some schematics, but the sizes and types were not listed.

I am sure this is a problem which is well known and solved for this 
application, so it might be easy to answer.  What specific types and 
sizes of caps are usually recommended?

-Tony