If you are planning a first trip, to Honduras, Sidewalkmystic.com is 

a useful introduction and has a lot of helpful tips.  

Also see Bay Islands Online

Use this Trip Planner to put in the dates for your intended

 trip and  see how the average weather in the Bay Islands is then.

Lempira Exchange Rate to the US dollar.

Read about the the Garifuna of the Honduras coast

Guanaja

Info

Bayman Bay Club
End of the World Resort
Hotels in Guanaja
Nautilus Dive Resort
 

Roatan

Info

A couple of car rental places

Business Directory

Diving on Roatan

Getting to the Bay Islands via

 airplanes, taxis and ferries

Real Estate

Roatan Internet Cafes

Que Tal Cafe

Utila 

Official Home Page

An Info Page

Business Telephone Directory

Transportation Info

Utila Princess Info

Bay Islands Conservation Association

Utila Internet Cafes

None appear to be online:

Bayview Internet Service

Cyber Café Internet

HideOut Internet

Howell's Internet Café

Internet Café

J.C Internet

Skype seems to be a great way to call internationally via Internet, but

 if you want to research cards, callingcards.com looks good too.

Roatan Hostels, Hotel and Resorts

(Note that most are expensive)

Hostel

Valerie's Youth Hostel, West End

eBananarama Diving Resort
Bay Islands Beach Resort
Cabaña Roatana
Casa de Paradise
Chillie's (a budget option) 

offline at West End,  Tel: 011-504-445-1246 
Coral Beach Inn
Dive Shops and Dive Resorts on Roatan
East End Lodge

Fantasy Island Beach Resort Dive & Marina - Official Website
Fantasy Island Beach Resort Dive & Marina - Honduras.com
Hotel Caribbean Dream
Hotels and Resorts on Roatan
Judy's Fantasea (inexpensive and it looks nice)
Keifito's Plantation Retreat (Official)

Las Rocas Resort

The Lost Paradise
Luna Beach Resort

Mariposa Lodge
Mermaid Beach Cabins
Oak Bay Resort (RoatanDiving.com)
Oceanside Inn Hotel
Paya Bay Beach Resort
Pinocchio's
Posada Arco Iris - Roatanet.com
Pura Vida
Roatan Vista Villas - scuba diving and vacation rentals
Roatan Vista Villas Scuba Diving Resort
       West Bay Lodge

Utila 

Cross Creek Dive Centre and Hotel  

(although geared toward divers, this is

 a budget hotel, charging $10 for a double)
Rooms in hotels or houses to rent in Utila
Laguna Beach Resort
The Mango Inn
Utila Beach Resort

Honduran Coast

La Ceiba

Info

Hotels in La Ceiba

Coco Pando Resort is not horribly expensive and looks interesting if you are thinking of a splurge.

La Ceiba Area

Jungle River Lodge is inexpensive and has tours

Villa Rhina - Club & Mountain Resort

Tela

Info

Garifuna Tours