Hello welcome back, its been a while I know.
Since I started my own business I've found tools like USB Flash drives, very valuable.
Here is a list of my most favorite tools.
USB Flash Drive
If you work with computers and you don't have one, perhaps you should change careers..
Applications
Scanner 2.0
This tool uses a unique concentric pie chart to display the usage of your hard disk or other media. The chart shows all major files and folders from all directory levels at once. Saved me 10% Harddrive space so far.
Spybot
Removes nasty spyware, malware and adware. I prefer this program above all the others, including Paid spyware removal programs.
Google Chrome
Great browser for with no fuss, you cannot install add-ons but, for normal everyday users (my customers) its is highly recommended.
Update:
Magical Jelly Bean Keyfinder
Despite is odd name, this keyfinder is great, I couldn't count on all my fingers and toes how may clients I've had who just threw away or lost their Office or OS CD's. just the other day a client had all the boxes but couldn't find the disks anywhere this way I could reinstall easy. I also always register the software Online with Microsoft.