Becky I think the best thing I can suggest is just to visit, be there for them and make them smile. The most precious moments to me throughout all of this was when someone walked in our door, just for a cuppa. It brightened our day, it was something normal and if they made me laugh or steve laugh it had been a wonderful day. Just visit, just be there. That's all we ever needed.
Also my mum was my rock. She did all my housework and groceries for me. She figured if she did all that then the time I had could be spent with Steve and I will forever be grateful to her for that. She never asked what we needed, she just did what she saw needed to be done. The last thing I had time or even thoughts towards was what could I get people to help with. I'm not one to ask for help and I didn't have the time to even try to ask. So be like my mum and just do. You are an amazing friend to be here even asking and thinking about this. Whatever you do for your friends it will be right and it will be needed, of that I have no doubt.