These are my favorite arm workouts! All of the pages that I will link are excellent resources for fitness and health. Lauren Hefez, BodyRock, Sia Cooper, visit their websites for awesome inspiration!
Long videos: Lauren Hefez' Perfect Bride Arms
Short video and with dancing (looove this one!):
Workouts with dip station and weights:
Body Rock's Stronger Leaner Arms
Easier workout with free weights:
By Fit Mommy Diaries (Visit website for each exercise's how to)