Difference between ipods?

[scarletcrossbones]

Could someone please explain to me in fairly simple terms(!) the difference between the ipod touch, nano, shuffle and ... umm ... any others out there that I don't know about!

I don't want bells and whistles - eg not interested in video - I just want something to play music and podcasts (TED talks, for example) when I'm out walking or running. So also, the best one to strap to my arm. And the best straps, please! I'm not asking for much here!

Or can I just play music/talks on my phone if I get a pair of earphones (it's a Samsung Galaxy Ace)? Can I transfer tracks from PC/Mac (I have both) to my phone? I really am that thick, sorry!