SM 7 B : What a workhorse!

Great mic for so many application! My favourite uses are as follows:

Guitar amp - slightly rounder sounding than an SM57, good for a slightly warmer tone. Works great for some rock and for a cleaner tone, if you're doing metal then stick to the SM57 as it's got a more cut!

Rock Vocals: Great SPL and warm tone for gritty male rock vocals! This thing will take whatever volume you throw at it and love it. The natural compression characteristics that you get inside a dynamic microphone work really nicely for a voice with gravel that can sometimes sound a little harsh in the upper mids. Works great for other male vocals as well, but especially for the gritty ones or full on screams.

HiHats: You'l think I'm crazy but if you take off the foam shield this is a fantastic hihat mic for a great rock sound. Again, just naturally compresses the signal a little and makes it warm and usable but still cut. Just takes a little bit of the harshness out and makes the hats sound a little more usable to me.

Its great on bass amps and some other sources but these are the main places that I find myself using it on a regular basis based on the kind of work I tend to get. All in all a great mic!