your best place to start would be your best friend google. There are hundreds of millions of articles on these phones.
Anyway, here's the summary.
iPod: stylish and user friendly mp3 player that easily syncs with the most popular digital music store, iTunes.
iPhone: apple's take on the smartphone. Great User interface, thermal touch screen, wide base of support (such as app store, homebrew applications, etc) and a huge popularity base. This phone has a great UI (user interface) and is very user friendly. This also syncs with iTunes. The biggest thing about the iPhone is the wide variety of native applications, fanbase, looks, clean user interface, and functionality.
Blackberry: A highly popular smartphone that is the iPhones biggest competition. With the recent release of the Blackberry Storm, apple's competition is fierce. The biggest function of the blackberry fleet is the push email, where you can edit folders and send and recieve email real time (e.g. you don't have to wait for the server). It's basically like having your favourite email client from your computer on your phone. Also, the blackberry has a huge array of native applications.
These definitions are very scarce, and i would highly reccomend using a search engine to find articles about these popular consumer electronics, but i hope this helped a little bit
Anyway, here's the summary.
iPod: stylish and user friendly mp3 player that easily syncs with the most popular digital music store, iTunes.
iPhone: apple's take on the smartphone. Great User interface, thermal touch screen, wide base of support (such as app store, homebrew applications, etc) and a huge popularity base. This phone has a great UI (user interface) and is very user friendly. This also syncs with iTunes. The biggest thing about the iPhone is the wide variety of native applications, fanbase, looks, clean user interface, and functionality.
Blackberry: A highly popular smartphone that is the iPhones biggest competition. With the recent release of the Blackberry Storm, apple's competition is fierce. The biggest function of the blackberry fleet is the push email, where you can edit folders and send and recieve email real time (e.g. you don't have to wait for the server). It's basically like having your favourite email client from your computer on your phone. Also, the blackberry has a huge array of native applications.
These definitions are very scarce, and i would highly reccomend using a search engine to find articles about these popular consumer electronics, but i hope this helped a little bit