Dropbox

What we liked:
Once Dropbox is installed and configured, you can forget about the service and just get on with sharing your files (up to 2GB per in total and 250MB each) between as many computers as you like.
Here's how it works: set up a free account, download the software (there are Windows, Mac and Linux versions) and then sign in. Dropbox appears as an extra option in your System Tray and behaves like any other folder. This means you can just drag and drop stuff onto it and then get on with something else while Dropbox uploads files and then synchronises them with any other PC that's signed into the same account.

We love the fact that you can use public folders to share files with anyone and use private ones to keep things ‘in the family'. The interface is great as well, with clever icons that tell you whether a file or folder is up to date or waiting to be synchronised. Dropbox also archives every file you create so it's easy to find older - and even deleted - versions.

How it can be improved:
It would be good to have more online storage in the free version of the service (Pro accounts are priced from $9.99 per month - about £6.20) and to make Dropbox completely browser-based with no software to download.