I can build database and program driven sites. These vary from mail forms and dynamic menus to full blown database applications with sign-ups, user log-ins, shopping etc. There is no limit.

The best way to keep your site dynamic is to change the content regularly. My CMS system allows this to be done easily see CMS.

Not that it matters, but I am much in favour of MySQL and PHP to build tailored dynamic sites.

One of my favorite applications allows users to upload files and store them in a secure manner. Access is limited to other chosen users only via passwords - 'hotlinking' is prevented. It even generates thumbnails of uploaded images.

See www.CCFulham.com for CMS site with some complex features for event management - I am particularly pleased with the ticketing and Volunteering system - though you can't see this part unless you are a volunteer!

www.Linden-House.org is a straightforward CMS site.

See www.lcsc.org.uk for an old dynamic site with calendar, member only areas (sorry I can't show them!) where members can book events upload their own files etc.