On a far less industrial scale than most (only got the allotment in Spring, so much of this is home grown):
Courgettes: the success story of this year, sowed in pots in March, grew in one of those mini-greenhouses then moved to large pots, then transplanted down the allotment. The 5 plants are now producing it seems like 1 a day, if they carry on like that, will definitely need to stretch the imagination to use them all up.
Onions: early spring planted sets in the garden (about 30 odd) are looking good, some huge ones.
Lettuce: iceberg in the garden have been abused as a cut and come again crop for several weeks now, still hanging in there. Mixed ones on the allotment yielded the first salad this week.
Rocket: Have had several servings from the garden, has now bolted but that's ok as I've had enough!
French beans: only planted a handful, and haven't had enough for a full serving for 2, only 1, once, and a few spares to sstick in salads. Sowed some on th allotment a few weeks ago and they are coming on nicely.
ditto peas (excluding the bit about the allotment)
Basil: has been growing well indoors. Is something we use every week at least once, and havent had to buy any for a few months, so all good. Outdoors planted stuff, tough and not that good so far.
Coriander: has gone mental and now to seed in the garden, have had several servings from it and soon will be de-seeding it. Still using the leaves though.
Leeks: some planted out in early spring are now getting there, need thinning but now swamped by the coriander
Tomatoes: hmm, seem ok, some tiny green toms, will wait and see. Some bought, some sown, some at home, some at the allotment.
Chillies, peppers: sowed early, start march, two small peppers in evidence so far on one plant, flowers on some others, hope remains high
carrots: a small row planted in early march at home, only 2 germinated, prob ready to dig up now, but the anticipation is probably nicer than the crop! Sowed some on the allotment a few weeks ago and they are doing nicely..thinned last night.
erm what else..
outdoor cucumber, tiny plant bought off market is now a healthy teenager with a few baby cukes on it. Has only just gone outside though, was in minigreenhouse before.
Garlic: speculatively planted some supermarket stuff in mid spring, sprouted well and has now keeled over, i guess i will fin nothing more than a slightly larger clove but will soon see.
Sweetcorn: very sulky, of 19 planted out only 10 or 11 are around to tell the tale, and then only small. Planted supersweet, think i will go for a hardier one next year.
turnips and cabbage -- planted down the allotment. Turnips coming on well, cabbages took an early hammering from birds, but some are still alive.
That's about it! ramble over.
edit: I know that wasn't all summer stuff, but it's amazing what a full bottle of red will do for the artistic licence.