A LERP (linear interpolation) returns you a value based on start and end key values and a fraction of the interpolation. 
E.g:

• When the fraction is 0 you are at the start
  
• When the fraction is at 1 you are at the end
  
• When the fraction is at 0.5 you are halfway
  

But if we replace the fraction with something non linear as long as its a function that returns a result in the range 0..1 we can get some more interesting results.   Trig curves like Sine are a good candidate and allow the creation of movement that has smooth acceleration and deceleration.

For my example I wanted to interpolate from key A to key B and then back to key A, so the part of the sin curve I should use goes from 0..PI.  So I take my input fraction, scale it by PI and then generate the Sin and I get a lovely smooth interpolation and back again.  If you simply wanted to go from Key A to Key B you would use 0..1/2PI.


//When something scary happens momentarily zoom the camera
float inter = (1.0f*fearCounter)/FEARCOUNTER;  //linear
inter*= 3.1415f; 
inter = Mathf.Sin(inter);
float fov = Mathf.Lerp(cameraFOV,cameraFOV/2.0f, inter);
localCamera.fieldOfView =fov;

Yesterday I imported some new assets, then created a giant level with several mazes using them and then when I came to light mapping I found out that I didn't have any UVs suitable for lightmapping and so I had the throw the entire level away and start from scratch. Which SUCKED.

Lesson:
On asset import, check the option for Generate Lightmaps.  This dialog on appears once and you only get one chance

Lesson:
This is meant to be fun right? :-(  Well at least it looks KINDA AWESOME!

Lesson:
Use prefabs properly.  Prefabs allow you to change every instance of an object in the scene in a single location.  However the UI is different to most other packages I've used.  In MOST packages when you make a change to an instanced object you are asked if you making a change to only that instance or all of them.  In Unity it works the other way around, the changes are always local unless you apply them using the prefab dialog:

This is something that has been bugging me for a while.  My game has heavy fog in it, which is fine through the game camera but means that when you zoom out in the Scene Editor everything is fogged in and you can't see anything.  I've been turning the fog off in Edit->Render Settings and often I forget to turn it back on.  Its an annoying workflow.  Turns out you can toggle a variety of effects on and off for the scene editor and fog is one of these.  Lighting is another, which will be useful for sinister night levels, I'm sure.