Move or Copy SharePoint Document Library Files

I was trying copy files across document library in different sites. Here's a well described blog that helped me to copy document library files programmatically.

http://geek.hubkey.com/2007/11/upload-file-to-sharepoint-document.html

SharePoint Document Libraries and users

A very nice article by Ian Morris for IT professionals to understand the different ways a user can interact with files stored in a SharePoint document library.

http://www.wssdemo.com/Blog/archive/2008/05/10/sharepoint-document-libraries-and-users.aspx