Most people won't have opportunity to do full-time service, but those lucky enough to have monetary wealth or some spare time really can make an enormous difference. As someone who's now in the public sector, and is seeing up-close-and-personal the real impact of what we do and what we give, I can tell you: every dollar and every volunteer help, in more ways than you can count.
My sister gave me a big bucket of Cool Whip. Isn't that awesome? For two weeks I basically watched Emergency! and ate cool whip with a spoon.