internet in samui

You have TOT, 3BB, CAT on the Island.There's also many WIFI operators like.
http://www.bluechipsamui.com/
forget about tot, it's the crappiest provider in thailand.

if you live on the mainroad CAT telecom is the best option but expensive 2k/month otherwise you have the very good 3bb with their indy connection 5 meg(now boosted to 7 meg) for 632 baht per month, installation fee and information can be seen on their website.