Overview over all the samples

gif (GifPipe)
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sprite         - Shows how to use sprites
point          - Shows how to use points (dots), star field.
line           - Shows how to use lines and linestrips
triangle       - Shows how to use triangles, triangle-/fans/strips
indirect fb    - Shows how to setup indirect framebuffer access, fire effect.
alphablending  - Shows how to usealphablending
ztest          - Shows how to use zbuffer test
bitmapfont     - Loads a bitmap font and renders a text using it
fontm          - Loads FONTM from ROM and renders a text using it
circuitblend   - Shows how use to reduce flicker in interlace resolutions.
textureformats - Shows the different texture formats supported.

vu0
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basic          - Loads a simple mesh and renders it with lightning
math           - Shows all the vu0 macro math functions

fpu
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basic         - Loads a simple mesh and renders it with lightning
math          - Shows all the fpu math functions

videmodes
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320x2nn       - Shows how to init a 320x224/256 (NTSC/PAL) resolution
512x384       - Shows how to init a 512x384 resolution
640x2nn       - Shows how to init a 640x224/256 (NTSC/PAL) resolution
640x2nn-i     - Shows how to init a 640x224/256 (NTSC/PAL) interlaced resolution

misc
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pad           - Shows how to to read joypad with Pad class, Pong game.
threadsema    - Shows how to use Thread and Semaphore classes    
scratchpad    - Shows how to move the stack onto scratchpad memory
c-wrapper     - Shows how to access ito from C
string        - Shows how to use the ito string class
linkedlist    - shows how to use the ito linkedlist class