I still have yet to try this this HttpHandler that will display all photos in its directory as a photo album on your website. It has been completely re-written to work with ASP.NET 2.0 and the c# source code is free and available for download. This seems like a really, really simple solution that can be easily deployed on an ASP.NET 2.0 website.
From GotDotNet:
“A simple photo album HttpHandler. Drop it in a web directory that contains photos and it just works. For ASP.NET 2.0 beta 2 and later.”
Download it here.