Like what most have said, I will often check out EPs and Bootlegs if they are of a band that I thoroughly enjoy. You often come across rare gems that you wouldn't have seen/heard otherwise.

As for singles, I rarely bother unless it is or includes a b-side song that I haven't heard before.

EPs are nice and funsized. I don't tend to bother checking out bootlegs or singles unless it's a band of which I'm a rabid fanboy.

I usually only get studio LPs but I'm also starting to get EPs. The rest I don't really care for.
For the Hip Hop fans, what do you'll think of yet another release format: the mixtape?

Hit and miss.Strongly depends who and what the general reaction is.

I DL quite a few mixtapes. Some I love, but being an hour normally in length they can be difficult to sit through unless the material is top notch. I like most of the ones I get though.