It depends if your ASP.NET (is it classic ASP or ASP.NET?) page is on the same server or a remote one. If running on the same server, you can just use the object model, provided that you run under an authorized account

If running on a different server (or from classic ASP), use web services, such as lists.asmx (usually http://[server]/_vti_bin/lists.asmx. It will give you access to all the lists items and their properties

Vladi