Copying more than one gigabyte in one operation is tedious, frustrating and agonizingly slow. Not that there is all that much you can do.
Scott Allen was having a little bit of difficulty so I’ thought I’d help a little.
Scott Hansellman has a post on 3 utilities you can use to copy files without using the windows explorer.
First, Robocopy. If you have XP or Windows Server you can easily get this in the Resource Kits. If you have Vista, it’s already in your path. That’s always nice. It’s Robust, indeed (hence, Robocopy) but it’s legendarily unforgiving
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Second, for repeatable jobs, I love SyncBackSE. It’s $30, but there is a free version with less features available. SyncBack is option-ful and literally moves nearly every important piece of data in my house around weekly.
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Last, but certainly not least, XXCOPY. It’s huge. Epic even. It’s even got a nice windows progress bar that pops out of the DOS Box. The Technical Reference is comprehensive to say the least. Here’s a summary of the features. It’ll sync directories, maintain short names, qualify by date/time, copy security info.
I’ve used Robocopy. The GUI frontend is next to useless (either that, or I’m doing something wrong).
I’ve yet to try the other two.
Hope this helps someone.
Random Musings 
Good list of solutions. As for me – I can fully agree with one guy’s post in this Scott Hansellman’s post. He told about secure copy. I’ve been using this tool for the last 3 years for server migrations, backups and big data copying. It works very stable and without any issues. It’s the ideal solution for migrating some 100s of gigabytes of data. All copying process run in a multithreaded way so the speed is much higher than with other tools. In server migrations, one very useful feature is keeping all shares and permissions intact.