Great suggestions everyone! I really appreciate your ideas. I'm going to be using them all over the next few months I think! For this weekend, I think i'll be doing:
Lucy's tomato salad
Salad with Paul Newman's Creamy Caesar Salad Dressing - thanks Smiles4you.
BBQ mushrooms (thanks Suse and Lucy for the tips)
Corn in foil (thanks to many people who suggested this!)
Tanstar's roast pumpkin salad
French stick per Kas' suggestion
Beef skewars with rosemary, garlic and redwine marinade (came up with this idea on the train this morning)

Tanstar - what do you put in your roast pumpkin salad?

I'm going to use all your seafood ideas for the next time I have my "couple who are doctors" around (they splurge big when we go around to theirs, so I feel obliged to lay on something nice for them).