Flow is a smart new FTP client for transferring files built specifically to use the new features found in Leopard.
The applications supports FTP, SFTP, WebDAV, .Mac and local connections and lets you carry out multiple transfers at once. Although it doesn't offer tabbed views, which I find absolutely necessary when working with different connections at once, it uses QuickLook to visualize files quickly in your Finder.
The interface is clean and simple, giving you the transfer rate for each file and a little progress bar to let you know has much has been uploaded/ downloaded. Programmers will enjoy having a built-in editor to modify code
The best feature of Flow surely is dropmarks. After creating a droplet in Flow, all you'll have to do is drag any file onto it to transfer it. Easy as pie!
Although it doesn't offer tabbed views, Flow is a smart new FTP client that makes great use of Leopard technology. Dropmarks are an excellent way of transferring files.