This beautiful and simple gift would work for Father's day with your child's birthday's stamped onto it. But could double as a reminder of an important date (anniversary or wedding gift)
I found it on etsy. ($10)
For the powerhouse of your family- this powered USB battery will come in handy when his cell phone is running on E. Just plug it in and he's good to go. Check this one out at thinkgeek.com ($20)
What about that dad who doesn't like the gas taste in his foods? But who loves to cook out on a moments notice. How about this charcoal grill? It folds up nice and small but folds out to be large enough to cook enough food for a family of 4 easily. (Amazon is carrying them for around $40)