Diet and Linksi - wow, great harvests! And Diet I think your tomatoes look lovely. I can see flowers! FLOWERS!
Kiwi - I got my plot at this time last year and you can get a decent harvest in a few weeks. If you can get some courgettes and runner beans on, they will reward you. Oh, and radishes and salad leaves of all kinds also. You can do some overwintering things for next spring too - caulis, cabbages, and (in the autumn) peas and beans.
Chuck - 2nd June!! You are a tomato champion!!! 
I open my greenhouse, so airborne blight spores can get in there! I do the same as goodbookdoes - throw the door open in the day, shut it at night. Maybe I should close it during the day too? But I think it might get too hot then (don't tomatoes have an upper limit of about 33 degrees after which they sulk??).
My friend lost all her greenhouse tomatoes in 2007 to blight, though it has to be said that this was an exceptionally rubbish summer, even by Sheffield's low standards. It just rained and rained and rained for weeks without remission and the city flooded terribly. The reason I remember this particular blight very vividly, though, is that I helped her to wash out the greenhouse with Jeyes fluid afterwards, and cackhandedly spilt some down me. I thought nothing of it, because that stuff stinks and the honk of it was all around us. Went home and showered. Could still smell it. Showered again. Changed clothes quickly and went out to dinner, which was a work thing so I was all poshed up in a frock and everything. Arrived at the restaurant and the moment I took my waterproof off, there was the Jeyes fluid again, wafting around to the point that you could almost see a cloud of billowing fumes encircling me. A couple of people stopped me and asked me about the "interesting" perfume that I was wearing. And we were having curry too, so it was hardly delicate and you could still smell it over the top! Very embarrassing and I still get teased about it now. 