Integrating ASP.NET applications with Sharepoint

This article provides a good rundown on the various ways that you can get ASP.NET applications and MOSS 2007 talking to each other.
http://blogs.msdn.com/sharepoint/archive/2007/10/26/integrating-sharepoint-with-other-portals-and-applications.aspx

One of my requirements for the property pipeline application here at Lend Lease is to provide a photo gallery that reads and writes to Sharepoint from an ASP.NET 3.5 app. Of course, the simplest way to do this would be to host the list in an iframe if possible...