If you're an OSX user and transfer files with ssh (scp) often, do yourself a favor and checkout the Fugu ssh app from Research Systems UNIX Group.
Fugu gives you a full GUI for ssh file transfer using scp and sftp. Of course, you could always just use the OSX terminal and issue the ssh and scp commands manually. However, if the exact file name and path on the remote system is unknown, and don't want to open a separate ssh session just to find it, then the Fugu ssh app fits your needs perfectly.
In reality, Fugu is just a GUI wrapper for OpenSSH, the version of ssh that ships with Apple's OSX. Many of the OpenSSH features are supported within Fugu, including ssh tunnels and ssh key authentication. Fugu also makes use of your OSX Keychain, allowing you to safely store your remote system credentials.
As handy as it is however, Fugu is not without its issues, the most notable of which is that it cannot download directories using sftp. This is a limitation of the OpenSSH sftp command that Fugu uses behind scenes so don't blame the Fugu developers. Attempt to download a directory, and Fugu states that it cannot do so with sftp and will ask to proceed with the download using scp instead. Respond affirmatively and you will be presented with a dialog containing various ssh/scp options.
From time to time, Fugu may become semi-unresponsive once a large or lengthy download has completed. I say “semi” unresponsive because the “Quit” command functions as expected, but any further ssh commands or attempted downloads produce no response. If this happens, just quit Fugu and crank it up again. I've never had it actually corrupt a download, just needs an occasional restart.
Despite its occasional hang ups, Fugu is a handy ssh file transfer utility that deserves a place in your OSX toolbox. You can download Fugu from the link below.