Read this before you buy suits (and I think you all plan to)... http://thorntree.lonelyplanet.com/messagepost.cfm?postaction=reply&catid=51&threadid=1207953&messid=10456207

Note posts 15 and 53, though its interesting to read the whole thing if you have time (or are bored at work).

http://www.travelfish.org/islands.php

To be used in conjunction with the andaman island-hopping page.. gives a neat little blurb on a fair few islands