I agree with some of the writers here, on camera flash, well, it's sub-optimal. But I would not give up on flash. I love RF for flash, used it for lots of weddings and event photography. The shots with flash stand out in my mind so I can see if I got expressions I wanted. Kind of like an LCD on the back of a digital camera.
I am in the process of breathing life back into a Vivitar 292 to use off camera (with a remote sensor on camera). I used 283 for years, but they are just a bit big for me today (getting old and picky I am).
I took a class at ICP (uptown) years ago that taught flash. A great short class with lots of hands on (polaroid instant slide film) was way cool for it. I loved the B&W slide stuff.
Get your flashes off camera, hold them in your left hand, focus and shot with your right (wind the flim with your right too). My 35 'cron and now my 40/1.4 CV have a tab that was just made for focusing with a ring finger.
Flash is no different from existing light, only brighter. It's a matter of painting the shadows, tweaking the size of the reflector (bounce perhaps) and thinking that makes flash photography work.
My father used to open up his flashes from work and put in a thin translusant film to cut down on the harshness of the light. Did wonders for his shots too (just like the kleenex idea from above).
B2 (;->