My DH almost did delivery our bub - he had one leg and the midwife had the other and they were helping me "push" the midwife actually said too him he could "catch" her if he wanted. Than my Ob arrived and she took over and he was up my end looking after me which he was more than happy to do - he did cut the cord tho!
And as for him looking - well i did snap at him at one stage telling him he couldn't look (cause i thought i was going too poop myself which thank god i didnt) i also saw the look of slight dissapointment on his face - in the end i didnt really care who looked! so yep DH got too see his daughter being born!