Remember that there is a ton of information available about DIY already. This page does not intend to be one more redundant resource, but rather focus on the ERE side of DIY. For example, a DIY'er wanting to grow his own food may want to try potatoes. But a DIY'er with an ERE bias would rather grow spices, because they use a lot less space and are much more expensive to buy on a weight-to-cost basis. Links to good resources on the web are very welcome.
See also: Day 17: Maintaining and repairing things (part of the Early Retirement Extreme 21-Day Makeover).