FarFinder not only gives you web access to your Mac, but also provides a lot of other services as well. One of these services is the ability to send files from your Mac to any email address -- remotely. Say, for example, that you're on the road and get a call from a co-worker who needs a copy of a document that's on your home machine. From your iPhone or a web browser, you can simply log into your Mac using a secure http connection, find the file on your Mac, and then email it to that person from FarFinder.
I often find that I need to look at documents that I've created on my Mac when I'm visiting clients. With another computer -- whether it's another Mac, a Windows machine, or even a Linux netbook -- you simply open up the web browser and connect to your home Mac. Once you've connected, it's a simple matter to double-click the file on the remote machine and open it for viewing. Some documents may need to be downloaded to your remote computer, which is accomplished by clicking a download icon.
Other services allow you to upload a file to your home Mac, do Spotlight searches of your Mac to find files, and even take pictures using your Mac's built-in iSight! The latter could be a lot of fun if you want to keep track of your pets or kids when you're on the road.
One thing I particularly like about FarFinder as opposed to other applications is that it does not allow you to control the screen on the remote Mac. Why is that a good thing? Well, FarFinder is very fast since it's not sending screen information over the Internet. Instead, it's just providing file information and displaying that on a web browser or iPhone screen.
The free iPhone app [iTunes Link] is essentially a mini version of the web application, performing most of the same functions with the unfortunate exception of not being able to do uploading. I'd love to be able to grab something from my Mac using the iPhone app, upload it to my iDisk, then use Quickoffice to download the file for editing on the iPhone. As it is right now, if the file isn't already on my iDisk, I can't do anything with it.
At US$20 for the next two weeks, FarFinder is a steal. It's a fast, secure, and easy-to-use remote access application, and well worth the minimal investment if you have more than one Mac or a Mac and an iPhone.