“Can You Run It?” from system requirements lab is a free web service that compares your PC specs against a large, constantly updated database of games and can tell you whether your computer is  sufficient to run any game that you are interested in. It can also give you a breakdown of individual components and tell you exactly where your computer stands in relation to the recommended and preferred specs and what areas or components to change or upgrade.

Favthumbs is a web service that can show del.icio.us bookmarks from any public account as thumbnails or iTunes-style carousel display.

gAttach is a free program that integrates Gmail into your system as your default email service, to be used by default instead of a local client when you send email or attach files from the desktop, the browser, or any local applications. (Note: you can also use Yahoomail as your default email service using sister application yAttach).

Click&Clean is a free tool that works alongside CCleaner to provide 1-click hard drive and browser cleanup from within Internet Explorer, Firefox, or the desktop Quick Launch bar. It can perform an instant, complete uninterrupted cleanup with CCleaner without exiting the browser or dealing with prompts and dilags.

CookiePie is an open source plugin for Firefox and other browsers that allows the user to open multiple accounts for services such as Gmail, Yahoo, eBay, Facebook, Twitter, or others in different tabs or browser windows simultaneously. It can also be used by developers who want to work with different versions of web pages with each tab or windows having its own distinct cookies environment.

Easy2Add for Outlook is a small app that allows you to quickly set up meetings, appointments, or events with Outlook using simple, regular English syntax. Accessed through the system tray or the Vista sidebar, this program resides in the background until you need it, without needing to open Outlook.

HP Smart Web Printing is a free browser extension for Internet Explorer and Firefox designed to enhance the process of printing webpages or (parts of webpages) from the browser. It allows you to "clip" elements of web pages, aggregate them, re-size and re-arrange them on a preview page before printing or saving them as a PDF document.

EditURLs is a small program that works with Internet Explorer and allows you to edit and save the dropdown list of URLs that Internet Explorer uses in the address box for URLs that are typed in manually.

Xobni is a free program that adds a sidebar with a slew of organizational functions to your Outlook. Principally built around organizing your Outlook data around people (similar in many ways to the Gmail model), Xobni provides a quick way to view threaded conversations with other people, view exchanged attachment history, view contacts you might have in common with another person, perform "lightning fast" searches, view email analytics data, and other functions.

MailStore Home is a free program that can backup your email from multiple email applications/accounts and consolidate these into a single, centralized archive that it can burn into a backup CD. Also offers the ability to perform advanced searches and quickly view archived email. Supported email clients include Outlook, Windows Mail, Outlook Express, Thunderbird, Exchange, as well as POP/IMAP accounts (including all webmail services that IMAP or POP support such as Gmail and Yahoo), and local files.

Deluge is a full-featured open source bittorrent client that runs on multiple platforms. It is designed to be low on system resources utilization while providing powerful features and a user friendly experience.