Synesthesia
Emotions -> colors  
Emotion -> flavor 
Emotion -> pain 
Emotion -> smell 
Emotion -> temperature 
Emotion -> touch 
Flavors -> colors 
Flavors -> sounds 
Flavors -> temperatures 
Flavors -> touch 
General sounds -> colors 
Graphemes -> colors
Grapheme -> flavor 
Grapheme personification 
   (a.k.a. Ordinal Linguistic Personification)
Kinetics -> colors 
Kinetics -> sounds
Lexeme -> touch 
Mirror touch 
Musical notes -> colors 
Musical notes -> flavors
Musical sounds -> colors 
Non-graphemic ordinal personification
Object personification
Orgasm -> colors 
Pain -> colors 
Pain -> flavor 
Pain -> smell 
Pain -> sound 
Personalities -> colors (“auras”) 
Personalities -> smells
Personalities -> touch
Phonemes -> colors 
Phoneme -> flavor
Phoneme -> touch 
Smells -> colors 
Smells -> flavor 
Smells -> sounds
Smells -> temperatures
Smells -> touch
Sound -> flavors 
Sounds -> kinetics
Sounds -> smells
Sound -> temperatures
Sound -> touch
Spatial sequence (number form)
Temperatures -> colors 
Temperature -> flavors 
Temperatures -> sounds
Ticker-tape 
Time units -> colors
Touch -> colors
Touch -> emotions 
Touch -> flavors
Touch -> smell
Touch -> sounds
Touch -> temperatures
Vision -> flavors 
Vision -> kinetics
Vision -> smells
Vision -> sounds
Vision -> Temperatures
Vision -> touch
There are more than 60 different types of synesthesia:
The numbers given are the percentage of synesthetes who have the given specific type, not the percentage of the general public.  About 3.7% of the general public has some form of synesthesia.
2.9%
0.2%
0.3%
0.2%
0.1%
0.1%
6.3%
0.2%
0.1%
0.1%
15.3%
64.4%
0.2%
4.6%

0.1%
0.5%
0.1%
***
8.5%
0.3%
19.2%
***
1.7%
2.0%
5.6%
0.1%
0.1%
0.2%
6.4%
0.5%
0.3%
7.5%
0.1%
0.1%
6.3%
0.2%
0.4%
0.1%
0.4%
5.2%
0.4%
1.5%
0.5%
4.4%
***
2.2%
0.1%
0.1%
1.0%
23.4%
3.8%
0.2%
1.0%
0.3%
0.8%
0.1%
2.9%
0.1%
1.3%
2.6%
0.2%
1.8%
Last updated: 10.July.2011
*** = insufficient data