I saw a posting elsewhere raving about a guide/driver who I also highly recommend, so I thought I'd pass it on.
The link to the recommendation is listed below, and it's for Wayan Subagia, email at subagia@hotmail.com and web site at http://members.tripod.com/subagia/
Wayan's spoken English is the best you will find in Bali, he's very reliable, a safe driver and you are guaranteed to have a great trip with him, and see sites and do things you would not have the opportunity to do otherwise. If you want a glimpse inside the culture, he can make sure you see the hidden Bali. He can also make great recommendations for hotels, and even arrange them for you if you like.