I started testing a new online gallery system last year, and will be including it for all weddings from 2014 onwards. You will get your own private, password protected gallery containing all of the images that are also supplied on your USB stick. The gallery allows you to share photos on Twitter and Facebook, as well as download files and buy prints directly online.
Most importantly the gallery looks beautiful and is very easy to use. And it works on all devices, including tablets.
Here's a couple of pictures showing an example of how it looks.