filegive easily sends or receives files point-to-point, with authentication and ciphering, and the other side only needs a Web browser. No third party server is involved in the transfer. It can use common NAT traversal protocols like uPnP and NAT-PMP, manually forwarded ports, or a public ssh server.
filegive is a commandline tool available for Linux, Windows and Mac OS.
Apple released yesterday the newest build of Mac OSX called Mavericks ( http://www.apple.com/osx/ ).
The Update is for free. If you use Matlab you may get Problems with the X11. The solution is rather simple:
just install the package from http://xquartz.macosforge.org/landing/
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Unfortunately, it became quite easy nowadays to infect your computer with malware:
Sometimes, webpages try to scare users to install a trojan. For example, there exists a trojan version of the program MacSweeper, which promises to clean your system 😛
More on the topic: http://www.computerhope.com/issues/ch001045.htm
The new Mountain Lion does not support the X11 environment anymore. There is an work arround to solve this easily:
http://xquartz.macosforge.org/landing/