In reply to UKC Gear:
I bought this book for a trip to Islay. It's a great guide book, and lacked nothing that I couldn't work out for myself. There's quite a lot of inspiring photos and descriptions.
Arran itself is plentifully described, but the smaller islands get a fair treatment. You may find yourself picking the book up and planning a holiday to somewhere like Rum just on what you read in this book.
Plenty of colour pics, and route maps where available are very good indeed.