Heres an SPX weekly chart.
You can see we're trading at the bottom of a channel. Although its not on the chart, everyone is aware there is a some serious capitulation volume going on. Every time we have ~2X-2.5X the average volume on the index products (ETFs, futures, actual shares, whatever) a bounce is right around the corner. Stat studies also show that the probability of being able to sell at a higher price 1 to 2 weeks out is very high. All that said, I don't think we're going to drive too much lower from this level... bear market rally is due.
Weekly MACD histo is bullish in the same way it has been in the most recent market tops and bottoms, however it lacks the same on the monthly (which the others have had).
From a long-term investment perspective, I'll refrain from jumping the gun and trying to get long here... a smart (and lurking) trader that used to post here said something smart to me just a little while ago... "bottoms aren't an event, they're a process". Its not worth getting steamrolled trying to catch it the first time when you can get in on a retrace to the "bottom". It'll take some time.