Frequently Used Nodes

yea, this is FUN!
this site is about all the lovely nodes a vvvv programmer uses all days. if you are missing one, add it:

note:
If you add a node, let us know a little about why it's important or what's special/cool/convenient about using it... of course, generalized usage info should go on the corresponding node reference page. But your special trick could go here as well

Basics:
IOBox (Value Advanced) - create with double right click
Inspektor (VVVV) - create with ctrl+i
Renderer (TTY) - console, logs errors and infos

Rendering:
Renderer (EX9)
Quad (DX9)
FileTexture (EX9.Texture)
Group (EX9)
Transform (Transform 3d)
Blend (EX9.RenderState)
DX9Texture (EX9.Texture)
Homography (Transform 2d) - correction of projection in general

Creation:
Random (Value)
Map (Value)
LFO (Animation)
Damper (Animation)
LinearSpread (Spreads)
RandomSpread (Spreads)
CircularSpread (Spreads)
GetSlice (Spreads)
Count (Value)
I (Spreads)
Select (Value)
Vector (3d Join)
Vector (3d Split)

Logic:
Change (Animation)
TogEdge (Animation)
Toggle (Animation)
FlipFlop (Animation)
AND (Boolean)
OR (Boolean)
= (Value)
Switch (Value Input)
MonoFlop (Animation)

Strings:
+ (String)
+ (String Spectral)
Separate (String)
Dir (File)
AsValue (String)
FormatValue (String)

he cracks, please continue...