The iPod Touch’s multi touch interface isn’t like any other mp3 player or pda. You do everything touching the screen instead of phyiscal buttons, here are 7 basic techniques for operating and navigating your ipod touch:

Tap
The most common interaction with your ipod touch will be tapping the on screen buttons. You cannot use a stylus, pen or anything else only skin contact works.  (There maybe a few exceptions to this, but not worth mentioning)

Slide
Some actions require you to slide your finger accross the screen, most notably when unlocking and  to confirm turning it off. The slide technique is also used for deleting files in certain screens such as emails, videos, images etc.

Drag
When your zoomed into webpage, photo or email you canuse your finger to drag in any direction. It’s similar to the flick but more controlled.

Flick
A flick is similar to the slide but faster and less controlled and usually in a vertical motion when navigating your music list (unless in album view). The faster your flick the faster the list will scroll, similar to real physics the list will slow down after a couple of seconds, so you can see what you ended up on or giving the screen a tap while its moving will stop it dead.

Pinch and Spread
The Pinch and Spread is a two finger technique usually done by placing a thumb and fore finger on the screen and spreading apart to zoom in or “pinching” together to zoom out. Usefull when viewing websites, mail, photos,  maps etc

Double Tap
The double tap is probably the least common technique used. Reserved for only 3 functions; In Safari, mail, photos, maps double tapping an area will automatically zoom in and fit that section to your screen, double tapping again will zoom back out. When viewing a video double tapping changes the aspect ratio.

Two Finger Tap
This interesting technique only appears to be valid using the maps application(requires jailbroken touch to install the map app).  The two finger tap lets you zoom out of a map, this lets you quickly move around zooming in with a double tap, and out with a two finger tap.