Would definitely stay at the Deep Blue Utila Resort! We stayed there in May 2005. It is true that it is only accessible by boat, but really...there's nothing to do in town anyway. You'll do so much diving with Deep Blue that you won't want to do anything but hit your room early each night. If you have any energy left at the end of the day, shoot pool or throw darts in their lodge.
The resort is new and is building their clientel. The owners, Jasmine and Steve, will make sure that you have a great diving exerience. Even though my husband and I were the only ones at the resort that week, we were taken to the North side every day. We never lifted our gear, even when it was stored at the harbor side and we wanted to do a shore dive in front of the resort. One of the staff will wheelbarrow your belongings to the ocean side and have it ready for you. Great shore diving in front of the resort...even if the entry is rocky.
PM me if you want more specifics....I still can't seem to take the time to adequately write out our experience. There are a couple of things to keep in mind...such as the beds tend to be kind of hard in the 2nd lodge...but the singles in the 1st lodge seem softer. I checked them out because I found the hardness of the "king" bed somewhat difficult to take after a few days. Also, Jaz cooks solid food, but she's a Brit...so there's not a ton of seasonings and sauces used. (Jaz - love the curry, though!) She also makes awesome mashed potatoes, banana cake, and tres leches. Once the resort takes off, she has plans to hire a chef. Hmmmmm.....I'm an awesome cook...AND I brew beer. Career change, maybe?
Enjoy Utila!