At the moment we are waiting for our leaders to come out from the coconut shell. We can't do anything, we can't even cross the border to go and help our brothers and sisters there.
My prof has following advice for us:
1) Dua' for Palestine (e.g. qunut nazila). Do it daily with confidence Allah will soon send His help.
2) Unite in the name of the deen. No more infighting. Put aside all the internal feuds within moslem nation.
3) Boycott Israeli and American products. This must be seriously done until the manufacturer of these products stop funding Israeli atrocities.
4) Do fund raising for Palestine.
5) Encourage our children, your own kids to save money everyday for Palestine. Tell them why.
6) Teach our kids who is zionist and who is jews in general.
7) Show pictures of Palestinians kids, infants that was killed by the zionist mercilessly. Tell our kids this is their friends in Gaza which being killed by this zionist (refer no. 6 above). This will create awareness to the children and when they grow up and Allah willing, they became our future leaders they will not follow the footsteps of our present moslem leaders who can only afford to read prepared text of condemnation statement.
of course the above may not be short term solution but as a moslem we must at least as much as we can to help our brothers and sisters in Palestine whether directly or indirectly. Remember little bird story which took small drop of water to help put off fire that are burning Prophet Ibrahim? What can small drop of water going to do to mountain size of fire is not count be the effort took by that little bird is count.