As far as the stock market goes, I think many investors are already aware that write-offs will continue well into 2009. With that said, continued write-downs may likely just be brushed off by the market in the future, as it sort of was in the past month or so.
What I think worries people now in particular (aside from oil of course) is unemployment numbers. There's a fair number of people employed by financial institutions, and the layoffs happen gradually and relatively under the covers. If unemployment numbers turn out sour we could see a further break in support.
Keep in mind that the long weekend is coming, and the month of May is coming to an end, so we'll start seeing more of the truth unveiled as we get the numbers in the coming week or 2.
By the way I often check this out for economic events http://biz.yahoo.com/ although it may not be the best out there
Just my 2c