Hi guys,
At the moment ArcPad 10 does not use attachments. It has always had the ability to create hyperlinks and now you can store the correct path of your file server when you are setting up your project e.g. When you check your data in it will copy from the sd card to the correct network location and basically run a calculate field over your data so the paths are pointing to the correct location.
So the hardiest thing is to decide where you are going to store the photos so people have access to them in this project, across your organisation and potentially the web.
Hope this helps.
Gareth