Adobe Illustrator CS3 and up has a feature called "live trace" which is like 
the old Streamline program, to trace raster images into vector format.
There is also an app called Vector Magic that can vectorize images, there is a 
demo online somewhere.

As a professional graphic designer breaking into programming, I make most of my 
icons with Illustrator, as almost all vector objects, then bring into Photoshop 
for final tweaking, at 512x512 pixel or 128x128 pixels, and then use either 
IconFactory's IconBuilder, or just save the PSD file with transparent 
background and drop into Apple IconComposer. For UI items I use .tif format, as 
it supports alpha channels (transparent areas), so it's suitable for buttons or 
just UI background items.

Here's a tip- Don't rely on a photo of something as your application icon. 
Consider that many people will view the icon at 16x16 (list view) or 32x32. Too 
much detail will destroy an (application) icon's visibility at small sizes. 


      

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