Looks more like Aglaonema than Dieffenbachia. Either way, good to confirm that it needs indirect sun or partial shade. The ceramic pot it was left in doesn't have drainholes. The soil was very dry, but now it's moist and the plant seems to like it. I'll move the plant to a regular pot with drain holes and better soil this weekend.

Grassy plants in 'B' is Liriope. C - the 5th photo looks like heavenly bamboo (nandina domestica) - a small cultivar, like 'Gulf Stream' or 'Harbor Dwarf'? Hard to see if the leaves are tri- pinnate in the photos. D - Aucuba japonica 'Gold Dust'. Prefers shade. Leaves burn in the sun, may be what the black leaves are, but I can't see enough detail to tell. E - Crepe myrtle - the flowers are too out-of-focus to be certain, but the distinctive seed pods cinch the crepe myrtle ID for me. F - second photo is an oak seedling. I don't think the 'holly' is a holly - at least, not an Ilex aquifolium or I. meservea. The new growth is purple, and not enough points on the leaves. G. Photinia doesn't have purple flowers. It has tiny white, wild-rose flowers in a cluster. The close-up of the groundcovers appear to be a morning glory (Ipomoea). I - the middle photo is photinia. The best photo you have of that shrub. Excellent focus, great lighting. K - I agree - some kind of maple. Opposite leaves cinch the ID. What's the deal with the tree stakes? N - could be a juniper. The photo is so washed-out and out-of-focus, it's hard to see detail, but I think I see one blue juniper berry on it. If it is a juniper, it will have 2 different types of leaves on the same branch. Juvenile leaves are needle-like and mature leaves are scale-like. Almost all of your photos were washed out, out of focus, or did not show details necessary to make a good ID. I agree with FataMorgana that you should post each plant separately. And take the photos early in the morning when the light is soft. At a minimum, you should take photos of the complete plant, the bark on the trunk (if it's a tree or shrub), one branch, a close-up of the tops and bottoms of the leaves, and a close-up of the flowers. Other characteristics of the plant that stand out, such as purple new growth, or fruit/seeds are helpful. Also, some plants have milky sap, chambered pith, hollow stems, etc., that are unique. Finally, some plants have distinctive scents when the leaves are crushed - yellow cedar smells like wet hay, incense cedar smells like...well, incense. Clerodendron leaves smell like peanut butter. All this information is helpful in identifying a plant that we can't touch, smell, or see with our own eyes over the internet. But conduct these examinations at your own risk- milky sap can often irritate the skin, and some plants have hairs that cause itching (itching powder that was sold in the back of comic books is actually the hairs from the big-leaf maple seed pods), for example. Have you considered asking a local County Extension agent of Master Gardener to come over and ID your plants, or take samples to their office or a local nursery? It's going to be painfully slow for you doing it this way.

Def. Cherry Laurel. Take care when pruning/removing, as the sap can irritate your skin. We've dug up the roots before, and couldn't help but notice how much like Vick's Cherry cough drops the smell was!

You should try the "Name That Plant" forum here on GardenWeb. The folks over there are able to identify just about everything, photo or not. Joe Here is a link that might be useful: Name That Plant! forum