picture 1: the tall one appears to be a sunflower of some sort. The smaller one on the left I don't know, but is probably a weed. The smaller one on the right is something in the: squash family.

Pic 2: same as above

Pic 3: Something in the squash family

Pic 4: Probably a cucumber, as you said.

Pic 5: Lamb's quarter. Considered a weed, but it is an edible weed.

Pic 6: Probably a sunflower, or a zinnia.

Pic 7: Plant on left, don't know, may be some sort of lettuce. Plant on right, most likely broccoli or cauliflower.

You really know your plants! I was wondering, do you think the plant on the bottom left in pic 1 is some type of strawberry plant?

Strawberrys don't have lobed leaves. There are 3 simple serrated leaflets on each petiole (stem).

I just bought some strawberry plants this weekend. I hope they do well!

I mostly agree with Kurtzapril4, but do have some other ideas.

Where I differ is with the "Then this." (pic 5) - it looks like a radish to me. The seeds will stay dormant for years and just randomly sprout (generally when tilling brings them to the right sprouting depth). I scatter plant them for the root development (builds the soil) and we eat a lot of them. The one in the bottom right of pics 1, 2, and 5 (small) is a very prolific weed. Pic 7 left looks a lot like sorrel and the one on the right is clearly a brassica but it's too early to identify for sure.

This is what I get for trying to grow so many things at once. I got sick of having to buy plants from the store, last year, cause mine kept dying on transfer/getting ate by bugs/squirrels/etc. So I went shotgun trying to grow lots of things then got overwhelmed with them all.

Some look like weeds - field mustard in the next to last one (I think) Edit: no that is broccoli as another said)

Agree about the squash/melon/cucumber ones

I do the same thing - plant seeds and then forget what I planted so i have to take a guess about which is a "real plant" and which is a stray weed. A lot of really nice flowers look like weeds before they get any blooms.

except the weeds, which I am getting good at. But if you are like me, you can have fun waiting for them to bloom or fruit to see what you have----I get a kick out of surprised myself. And if you still need help when they flower, that will make it easier.

A + B= don't know what they are, but they aren't watermelon. Since they seem to be all over the place, I would guess a weed.
C + D= Hair allium
E= Pretty sure it's a weed.

A and B are Japanese Hops. Annual hops species that is grown as an ornamental (although usually the green and white or gold and green variegated forms) or for herbal/medicinal use. It's a long vine, needs a trellis.

C and D are indeed the ornamental allium 'Hair' -- http://www.johnscheepers.com/catview.cgi?_fn=Item&_recordnum=1172

E is Malva neglecta aka Cheese mallow. Member of the hibiscus family. Leaves can be used raw in salads when young and tender, or cooked as a green. The flowers turn into round pods that look like a cheese wheel, and can also be eaten in salads when young and tender.

Those ID's were bugging the hell out of me!

This is going to help me next year unless some other strange invaders pop up.