I am looking at a buying an iPod (probably 20gb version) for mrs alect - as her "push present" (our first child is due any day now).

I found that there are HP Apple Ipods - how are these different to the standard Apply iPods? Just the branding?

also even for the 20Gb versioin, there seem to be different generations and models. Is there only one current model and generation while the others are older discontinued ones? And if so is there a real downside to buying one fo the older models?