Best bet IMO is flea beetles, tiny black beetles that hop like fleas. It is that time of year for them. Their classic damage is called shotgun holes in leaves like in your first picture. If you brush your hands over the leaves in the early AM you should see them hopping around. Google them for pics.

Few pesticides have any effect on them and for most they are just considered a nuisance pest rather than a serious one. The plants can tolerate the damage they do with little effect and they have a relatively short lifespan. The biggest threat they pose is to very young seedlings but once the plant gets established the damage poses no real threat. Keep in mind that a plant can lose up to 50% or more of its leaf surface area and still do fine so the damage in your photos is relatively minor.

If a serious infestation develops then insect barrier row covers are the most effective control.

Dave

I agree with Digdirt on the first photo of pepper leaf damage. It's hard to sneak up on flea beetles as they hop away once they spot you first. They appear as tiny specks of black pepper on the leaves. The best organic way to get them off your peppers and other veggies is to plant a couple of eggplants, it's their favorite most irresistible snack of all time ;-). The lower pic looks more like slug and/or misc looper damage, best guesses.