There's a few unanswered questions in the last couple of posts I'll try to address:
First, on the issue of double shocks. Double shocks really aren't necessary unless you do desert racing where the suspension has to move up and down rapidly for extended periods of time. Single shocks would fade due to the heat buildup. The downside is that double shocks will give you a stiffer ride. But for street, rock crawling, or moderate offroading a good quality single shock would probably be a better choice. Everyone raves about Bilstein shocks and that's what I have on my Bronco.
Second, on track bar drop brackets. Using a track bar drop bracket will put the track bar geometry back to stock, which keeps the front axle centered under the vehicle. Without one the axle would sit off center. There are other alternatives however, depending on budget and complexity. An adjustable track bar can be used instead. Some don't like the additional stress the drop bracket could put on the frame and opt for a custom bracket to raise the track bar mounting point on the axle itself. The same thing applies to a drop pitman arm. You can opt to do a tie rod over conversion that would raise the tie rod by 3 inches and avoid having to use a drop pitman arm. Plus by raising the tie rod you decrease the likelyhood of bashing your tie rod on unfriendly objects.
On the bronco lean there are lots of threads you can search. Also check out the following link:
http://www.broncofix.com/Tech/lean/lean.htm
The hardest part of the install for me was getting the front axle reconnected to the radius arms. Not really all that difficult. The trick was to disconnect the front drive shaft so I could put in the radius arms and have more movement to get the axle into place.
On the harsh ride issue, most complaints are from guys that run add-a-leafs. Add-a-leafs do not do anything to increase articulation plus they actually stiffen the existing springs. A good set of leaf springs will actually contain more leafs (mine have eleven), which gives you a softer ride and increases the suspension's ability to flex. It's definately the way to go, but the trade off is $$.
Not all coils are the same either. Some of the cheaper lift kits have very stiff coils. Lots of guys like the BC Broncos coils and that's what I run on mine. They ride very nice and actually are NOT progressive rate coils, they are just very soft.