I actually started looking at this the other day on Open Courseware - as I'd set myself a resolution this year to put together a little embedded\SBC system and needed to understand electronics in more detail[0]. It's a little bit intimidating. For example in the first few sentences he started referring to Maxwell's equations in very familiar terms (something like "we all know about Maxwell's equations already...") which threw me slightly and made me wonder if there's probably a better introduction to electronics out there.