I am not sure about the Frommer's edition, but the current Lonely Planet edition is as fresh as circa 2006ish. For the first 4 weeks that I will be with Opwall, all of the accommodations are taken care of, for when I return to Utila, I checked out the rankings and reviews on Tripadvisor, and decided on the lighthouse. The location seems good, and although it is one of the more "expensive" hotels, it is still very reasonable. Me and my friend will be staying there between August 16th and 24th. For my last week, I was thinking of going back to Cayos Cochinos, PBR is the only place to stay there. When I am there earlier with Opwall it will be pretty much camp-style cabins or tents on the beach I believe, but as far as commercial resorts, the only one is Plantation, but I think with 4 dives a day, unlimited shore and 3 meals, it seems like a pretty good deal to me. Although I have heard that transport to and from the island is a bit pricey, and that is a part I still trying to figure out.
I was originally thinking about Utopia, but it is more expensive at $255 ppd with only 2 dives. I haven't booked my stay at PBR yet, as I want to figure out the boat transfer situation first. I will be going back to Uitla the night before my flight, and will probably stay at the lighthouse that night. It's too bad you aren't going a week or two later...
Maybe we can meet up at Treetanic for a beer when you get in, I can't imagine they will have me busy analyzing data EVERY night... lol! I will be at Coral View from the 20th until the 26th before going to Cayo Menor. What kind of graduate program are you doing? I am currently doing a Master's in Environmental Studies in Sustainable Coastal Marine Tourism & Conservation.
Carey