We had a relatively minor earthquake near here (a 5.8 one just south of the Mexican border) 2 weeks ago that didn't even manage to skew the pictures and calenders on my wall here in San Diego. It wasn't scary (unless for folks experiencing their first one, perhaps), but it did remind a bunch of us that one of these days the more appropriate immediate verbal response to the shaking on the ground would be 'Sh*t!' instead of 'Cool!'... Port au Prince, Haiti is apparently on the same type of fault line as California's (in)famous San Andreas Fault (it doesn't run through San Diego, but skirts the mountains on our eastern border), so I can imagine what's going on there happening near here one day (perhaps not to the same catastrophic extent, but still not 'Cool!' inducing in the least).
So, for those of us who haven't already done anything to help but would like to (after all, just sitting there feeling sorry for the Haitians really aren't going to do them or anyone any good), here is a great webpage listing what organizations are on the ground in Haiti who can really use your donation (of any size) and how to contact them... along with helpful precautions against those soulless predators who wouldn't think twice about setting up a scam on the 'help Haiti here' theme to benefit themselves.
A lot of Haitians were living on $2 a day, so even a $5 donation would go a much longer way there than you might expect.