increase available IO pin options

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i've been reading different threads shift registers, , drivers etc... i'm still having hard time understanding best options different ways increase io pin scenario... advice?

i have uno ethernet shield (so understand can't use digital 10,11,12,13 normal i.o , 4?, correct? )

my set is,

digital 0 - unused (so far)
digital 1 - unused (so far)
digital 2 - input_pullup n.o switch
digital 3 - input_pullup n.o switch
digital 4 - unused
digital 5 - input_pullup n.o switch
digital 6 - output 5v relay
digital 7 - output 5v relay
digital 8 - output 5v relay
digital 9 - unused (so far)


so have 3 pins left use understand. 0,1,9.
i add couple 7 segment led's, , in future 1 or 2 more input_pullup switches , 1 or 2 more output relays.

any great. thanks!

you don't mention a0-a5
these can used digital inputs , outputs also.

you @ option also:
http://forum.arduino.cc/index.php?topic=439838.0

.


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