I'm planning a honeymoon to the Greek Islands in August for ten days. Any suggestions for an itinerary? We definitely want to spend a lot of time on the beach but would be interested in some culture and nightlife as well.
Any suggestions for a website to book reasonably priced hotels?

There's so many to choose from it's difficult to make a recommendation. I personally always recommend the Cyclades group because I've spent the most amount of time there, Santorini being my favorite. For a Honeymoon I strongly urge you to check out Oia on Santorini, or any cliffside village with a view of the caldera. Here's a link to a website that lists many hotels there categorized by village and hotel "class". I think Oia has become one of the most popular honeymoon destinations in Greece.
You can move through the Cyclades easily by ferry, both car ferry and Flying Dolphin, as long as the winds aren't too strong for them to travel.

Naxos and Mykonos are both known for their nice beaches, although Mykonos is more popular with honeymooners and party-goers. Ios is the "party island" of the group, August is a 24/7 Rave there. The main village of Fira on Santorini also has a very respectable nightlife, and the island has 2 archaeological sites and a couple of hiking trails.

http://www.santorinihotels.com/hotels.php

I agree the the brother he has a good selection .Try Paros for beaches especially around Naoussa it was our favourite village on all the islands we visited and easy to get to a huge range of lovely beaches and villages like Drios.great culture lots of varied night life and plenty of sun.
try www.holiday-rentals.co.uk

Thanks for your responses!