Photomatrix
Pros -
- Very easy to do.
- Changes are instantly visible
- Can produce some simply amazing sky.
- Lots of controls.
Cons -
- Can look very artificial.
- Can produce a halo effect around high contrast areas
- Can produce strange lighting in areas which obviously shouldn't have as much light.
- Lots of controls.
There isn't much point in me repeating work already done... so why not take a look at this
tutorial by GainfulShrimp. Remember and don't be shy about fiddling with the tone mapping controls. You can always redo the HDR.