Who me, good questions.
Theoretically indicators work equally well regardless of the period. The period can be a minute, an hour, a day, a week or a month, and the effect should be the same.
As far as an indicator that can tell you when something is too oversold, well, that is sort of the holy grail of technical issues. What I use, and it is on my charts, is the ROC indicator, or Rate Of Change. This is simply a measure of the speed and intensity of the drop or rise. It DOES NOT mean that the price cannot continue to drop, simply that the most intense drop has already happened. If you look on my charts , the ROC usually bottoms before the other indicators do. Once again, guessing the exact bottom is nearly impossible, what you want to get is the middle 70% of each move. That eliminates a lot of the risk.
As far as catastopic drops, this is perhaps my biggest pet peave. I stopped trading individual stocks for that reason. I trade qqq's which is a basket of the 100 biggest Nasdaq stocks. Sometimes I will trade the SMH's which is a basket of semiconductor stocks that is a little more volitle.
By the way, Alcan took a big jump the other day, the chart looks quite good for intermediate term investors.
I think the web site i use, stockcharts.com has an explaination of the indicators, it may have the formulas too, I will check. Don't get too crazy with indicators, pick one or two that are reliable, and back test them to see how they work. The rest of trading is money management and "feel".
Amazon has a pretty good supply of trading books, my favorite is by Martin Pring, but i do not know the name of the book. Larry McMillan is also very good, with a focus on option trading.