Is there any utility to download/upload the files from/to Sharepoint other than Sharepoint portal/Windows Explorer?

You can use your Sharepoint designer for this.

What is your business requirement? I've seen utilities on codeplex that do this kind of thing. Powershell may also be a good option.--Paul Galvin, Computer Generated Solutions (CGS) Microsoft MVP - SharePoint Blogging @ http://www.mstechblogs.com/paul Twitter @ http://www.twitter.com/pagalvin

How can I upload/download using Powershell?

Microsoft Office picture manager can bulk upload images to a picture library Refer the following links which supplies powershell script to add files to the document library, http://blogs.technet.com/b/heyscriptingguy/archive/2010/09/23/use-powershell-cmdlets-to-manage-sharepoint-document-libraries.aspx http://wiki.threewill.com/display/enterprise/Add+Files+to+a+SharePoint+Document+Library+using+PowerShellaravind